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OLED

February 15, 2024

An organic light-emitting diode (OLED), also known as organic electroluminescent (organic EL) diode,[1][2] is a type of light-emitting diode (LED) in which the emissive electroluminescent layer is an organic compound film that emits light in response to an electric current. This organic layer is situated between two electrodes; typically, at least one of these electrodes is transparent. OLEDs are used to create digital displays in devices such as television screens, computer monitors, and portable systems such as smartphones and handheld game consoles. A major area of research is the development of white OLED devices for use in solid-state lighting applications.[3][4][5]

Organic light-emitting diode
Prototype OLED lighting panels
TypeLED

There are two main families of OLED: those based on small molecules and those employing polymers. Adding mobile ions to an OLED creates a light-emitting electrochemical cell (LEC) which has a slightly different mode of operation. An OLED display can be driven with a passive-matrix (PMOLED) or active-matrix (AMOLED) control scheme. In the PMOLED scheme, each row and line in the display is controlled sequentially, one by one,[6] whereas AMOLED control uses a thin-film transistor (TFT) backplane to directly access and switch each individual pixel on or off, allowing for higher resolution and larger display sizes.

OLED is fundamentally different from LED, which is based on a p-n diode structure. In LEDs, doping is used to create p- and n-regions by changing the conductivity of the host semiconductor. OLEDs do not employ a p-n structure. Doping of OLEDs is used to increase radiative efficiency by direct modification of the quantum-mechanical optical recombination rate. Doping is additionally used to determine the wavelength of photon emission.[7]

An OLED display works without a backlight because it emits its own visible light. Thus, it can display deep black levels and can be thinner and lighter than a liquid crystal display (LCD). In low ambient light conditions (such as a dark room), an OLED screen can achieve a higher contrast ratio than an LCD, regardless of whether the LCD uses cold cathode fluorescent lamps or an LED backlight. OLED displays are made in the same way as LCDs, including manufacturing of several displays on a mother substrate that is later thinned and cut into several displays and comes in the same sizes as those used for manufacturing LCDs, but after TFT (for active matrix displays), addressable grid (for passive matrix displays) or indium-tin oxide (ITO) segment (for segment displays) formation, the display is coated with hole injection, transport and blocking layers, as well with electroluminescent material after the first 2 layers, after which ITO or metal may be applied again as a cathode and later the entire stack of materials is encapsulated. The TFT layer, addressable grid or ITO segments serve as or are connected to the anode, which may be made of ITO or metal.[8][9] OLEDs can be made flexible and transparent, with transparent displays being used in smartphones with optical fingerprint scanners and flexible displays being used in foldable smartphones.

History edit

André Bernanose and co-workers at the Nancy-Université in France made the first observations of electroluminescence in organic materials in the early 1950s. They applied high alternating voltages in air to materials such as acridine orange dye, either deposited on or dissolved in cellulose or cellophane thin films. The proposed mechanism was either direct excitation of the dye molecules or excitation of electrons.[10][11][12][13]

In 1960, Martin Pope and some of his co-workers at New York University in the United States developed ohmic dark-injecting electrode contacts to organic crystals.[14][15][16] They further described the necessary energetic requirements (work functions) for hole and electron injecting electrode contacts. These contacts are the basis of charge injection in all modern OLED devices. Pope's group also first observed direct current (DC) electroluminescence under vacuum on a single pure crystal of anthracene and on anthracene crystals doped with tetracene in 1963[17] using a small area silver electrode at 400 volts. The proposed mechanism was field-accelerated electron excitation of molecular fluorescence.

Pope's group reported in 1965[18] that in the absence of an external electric field, the electroluminescence in anthracene crystals is caused by the recombination of a thermalized electron and hole, and that the conducting level of anthracene is higher in energy than the exciton energy level. Also in 1965, Wolfgang Helfrich and W. G. Schneider of the National Research Council in Canada produced double injection recombination electroluminescence for the first time in an anthracene single crystal using hole and electron injecting electrodes,[19] the forerunner of modern double-injection devices. In the same year, Dow Chemical researchers patented a method of preparing electroluminescent cells using high-voltage (500–1500 V) AC-driven (100–3000 Hz) electrically insulated one millimetre thin layers of a melted phosphor consisting of ground anthracene powder, tetracene, and graphite powder.[20] Their proposed mechanism involved electronic excitation at the contacts between the graphite particles and the anthracene molecules.

The first Polymer LED (PLED) to be created was by Roger Partridge at the National Physical Laboratory in the United Kingdom. It used a film of poly(N-vinylcarbazole) up to 2.2 micrometers thick located between two charge-injecting electrodes. The light generated was readily visible in normal lighting conditions though the polymer used had 2 limitations; low conductivity and the difficulty of injecting electrons.[21] Later development of conjugated polymers would allow others to largely eliminate these problems. His contribution has often been overlooked due to the secrecy NPL imposed on the project. When it was patented in 1974[22] it was given a deliberately obscure "catch all" name while the government's Department for Industry tried and failed to find industrial collaborators to fund further development.[23] As a result publication was delayed until 1983.[24][25][26][27]

Practical OLEDs edit

Chemists Ching Wan Tang and Steven Van Slyke at Eastman Kodak built the first practical OLED device in 1987.[28] This device used a two-layer structure with separate hole transporting and electron transporting layers such that recombination and light emission occurred in the middle of the organic layer; this resulted in a reduction in operating voltage and improvements in efficiency.

Research into polymer electroluminescence culminated in 1990, with J. H. Burroughes at the Cavendish Laboratory at Cambridge University, UK, reporting a high-efficiency green light-emitting polymer-based device using 100 nm thick films of poly(p-phenylene vinylene).[29] Moving from molecular to macromolecular materials solved the problems previously encountered with the long-term stability of the organic films and enabled high-quality films to be easily made.[29] Subsequent research developed multilayer polymers and the new field of plastic electronics and OLED research and device production grew rapidly.[30] White OLEDs, pioneered by J. Kido et al. at Yamagata University, Japan in 1995, achieved the commercialization of OLED-backlit displays and lighting.[31][32]

In 1999, Kodak and Sanyo had entered into a partnership to jointly research, develop, and produce OLED displays. They announced the world's first 2.4-inch active-matrix, full-color OLED display in September the same year.[33] In September 2002, they presented a prototype of 15-inch HDTV format display based on white OLEDs with color filters at the CEATEC Japan.[34]

Manufacturing of small molecule OLEDs was started in 1997 by Pioneer Corporation, followed by TDK in 2001 and Samsung-NEC Mobile Display (SNMD), which later became one of the world's largest OLED display manufacturers - Samsung Display, in 2002.[35]

The Sony XEL-1, released in 2007, was the first OLED television.[36] Universal Display Corporation, one of the OLED materials companies, holds a number of patents concerning the commercialization of OLEDs that are used by major OLED manufacturers around the world.[37][38]

On 5 December 2017, JOLED, the successor of Sony and Panasonic's printable OLED business units, began the world's first commercial shipment of inkjet-printed OLED panels.[39][40]

Working principle edit

 
Schematic of a bilayer OLED: 1. Cathode (−), 2. Emissive Layer, 3. Emission of radiation, 4. Conductive layer, 5. Anode (+)

A typical OLED is composed of a layer of organic materials situated between two electrodes, the anode and cathode, all deposited on a substrate. The organic molecules are electrically conductive as a result of delocalization of pi electrons caused by conjugation over part or all of the molecule. These materials have conductivity levels ranging from insulators to conductors, and are therefore considered organic semiconductors. The highest occupied and lowest unoccupied molecular orbitals (HOMO and LUMO) of organic semiconductors are analogous to the valence and conduction bands of inorganic semiconductors.[41]

Originally, the most basic polymer OLEDs consisted of a single organic layer. One example was the first light-emitting device synthesised by J. H. Burroughes et al., which involved a single layer of poly(p-phenylene vinylene). However multilayer OLEDs can be fabricated with two or more layers in order to improve device efficiency. As well as conductive properties, different materials may be chosen to aid charge injection at electrodes by providing a more gradual electronic profile,[42] or block a charge from reaching the opposite electrode and being wasted.[43] Many modern OLEDs incorporate a simple bilayer structure, consisting of a conductive layer and an emissive layer. Developments in OLED architecture in 2011 improved quantum efficiency (up to 19%) by using a graded heterojunction.[44] In the graded heterojunction architecture, the composition of hole and electron-transport materials varies continuously within the emissive layer with a dopant emitter. The graded heterojunction architecture combines the benefits of both conventional architectures by improving charge injection while simultaneously balancing charge transport within the emissive region.[45]

During operation, a voltage is applied across the OLED such that the anode is positive with respect to the cathode. Anodes are picked based upon the quality of their optical transparency, electrical conductivity, and chemical stability.[46] A current of electrons flows through the device from cathode to anode, as electrons are injected into the LUMO of the organic layer at the cathode and withdrawn from the HOMO at the anode. This latter process may also be described as the injection of electron holes into the HOMO. Electrostatic forces bring the electrons and the holes towards each other and they recombine forming an exciton, a bound state of the electron and hole. This happens closer to the electron-transport layer part of the emissive layer, because in organic semiconductors holes are generally more mobile than electrons. The decay of this excited state results in a relaxation of the energy levels of the electron, accompanied by emission of radiation whose frequency is in the visible region. The frequency of this radiation depends on the band gap of the material, in this case the difference in energy between the HOMO and LUMO.

As electrons and holes are fermions with half integer spin, an exciton may either be in a singlet state or a triplet state depending on how the spins of the electron and hole have been combined. Statistically three triplet excitons will be formed for each singlet exciton. Decay from triplet states (phosphorescence) is spin forbidden, increasing the timescale of the transition and limiting the internal efficiency of fluorescent devices. Phosphorescent organic light-emitting diodes make use of spin–orbit interactions to facilitate intersystem crossing between singlet and triplet states, thus obtaining emission from both singlet and triplet states and improving the internal efficiency.

Indium tin oxide (ITO) is commonly used as the anode material. It is transparent to visible light and has a high work function which promotes injection of holes into the HOMO level of the organic layer. A second conductive (injection) layer is typically added, which may consist of PEDOT:PSS,[47] as the HOMO level of this material generally lies between the work function of ITO and the HOMO of other commonly used polymers, reducing the energy barriers for hole injection. Metals such as barium and calcium are often used for the cathode as they have low work functions which promote injection of electrons into the LUMO of the organic layer.[48] Such metals are reactive, so they require a capping layer of aluminium to avoid degradation. Two secondary benefits of the aluminum capping layer include robustness to electrical contacts and the back reflection of emitted light out to the transparent ITO layer.

Experimental research has proven that the properties of the anode, specifically the anode/hole transport layer (HTL) interface topography plays a major role in the efficiency, performance, and lifetime of organic light-emitting diodes. Imperfections in the surface of the anode decrease anode-organic film interface adhesion, increase electrical resistance, and allow for more frequent formation of non-emissive dark spots in the OLED material adversely affecting lifetime. Mechanisms to decrease anode roughness for ITO/glass substrates include the use of thin films and self-assembled monolayers. Also, alternative substrates and anode materials are being considered to increase OLED performance and lifetime. Possible examples include single crystal sapphire substrates treated with gold (Au) film anodes yielding lower work functions, operating voltages, electrical resistance values, and increasing lifetime of OLEDs.[49]

Single carrier devices are typically used to study the kinetics and charge transport mechanisms of an organic material and can be useful when trying to study energy transfer processes. As current through the device is composed of only one type of charge carrier, either electrons or holes, recombination does not occur and no light is emitted. For example, electron only devices can be obtained by replacing ITO with a lower work function metal which increases the energy barrier of hole injection. Similarly, hole only devices can be made by using a cathode made solely of aluminium, resulting in an energy barrier too large for efficient electron injection.[50][51][52]

Carrier balance edit

Balanced charge injection and transfer are required to get high internal efficiency, pure emission of luminance layer without contaminated emission from charge transporting layers, and high stability. A common way to balance charge is optimizing the thickness of the charge transporting layers but is hard to control. Another way is using the exciplex. Exciplex formed between hole-transporting (p-type) and electron-transporting (n-type) side chains to localize electron-hole pairs. Energy is then transferred to luminophore and provide high efficiency. An example of using exciplex is grafting Oxadiazole and carbazole side units in red diketopyrrolopyrrole-doped Copolymer main chain shows improved external quantum efficiency and color purity in no optimized OLED.[53]

Material technologies edit

Small molecules edit

 
Alq3,[28] commonly used in small molecule OLEDs

Organic small-molecule electroluminescent materials have the advantages of a wide variety, easy to purify, and strong chemical modifications. In order to make the luminescent materials to emit light as required, some chromophores or unsaturated groups such as alkene bonds and benzene rings will usually be introduced in the molecular structure design to change the size of the conjugation range of the material, so that the photophysical properties of the material changes. In general, the larger the range of π-electron conjugation system, the longer the wavelength of light emitted by the material. For instance, with the increase of the number of benzene rings, the fluorescence emission peak of benzene, naphthalene, anthracene,[54] and butyl gradually red-shifted from 283 nm to 480 nm. Common organic small molecule electroluminescent materials include aluminum complexes, anthracenes, biphenyl acetylene aryl derivatives, coumarin derivatives,[55] and various fluorochromes. Efficient OLEDs using small molecules were first developed by Ching W. Tang et al.[56] at Eastman Kodak. The term OLED traditionally refers specifically to this type of device, though the term SM-OLED is also in use.[41]

Molecules commonly used in OLEDs include organometallic chelates (for example Alq3, used in the organic light-emitting device reported by Tang et al.), fluorescent and phosphorescent dyes and conjugated dendrimers. A number of materials are used for their charge transport properties, for example triphenylamine and derivatives are commonly used as materials for hole transport layers.[57] Fluorescent dyes can be chosen to obtain light emission at different wavelengths, and compounds such as perylene, rubrene and quinacridone derivatives are often used.[58] Alq3 has been used as a green emitter, electron transport material and as a host for yellow and red emitting dyes.

Because of the structural flexibility of small-molecule electroluminescent materials, thin films can be prepared by vacuum vapor deposition, which is more expensive and of limited use for large-area devices. The vacuum coating system, however, can make the entire process from film growth to OLED device preparation in a controlled and complete operating environment, helping to obtain uniform and stable films, thus ensuring the final fabrication of high-performance OLED devices.However, small molecule organic dyes are prone to fluorescence quenching[59] in the solid state, resulting in lower luminescence efficiency. The doped OLED devices are also prone to crystallization, which reduces the luminescence and efficiency of the devices. Therefore, the development of devices based on small-molecule electroluminescent materials is limited by high manufacturing costs, poor stability, short life, and other shortcomings. Coherent emission from a laser dye-doped tandem SM-OLED device, excited in the pulsed regime, has been demonstrated.[60] The emission is nearly diffraction limited with a spectral width similar to that of broadband dye lasers.[61]

Researchers report luminescence from a single polymer molecule, representing the smallest possible organic light-emitting diode (OLED) device.[62] Scientists will be able to optimize substances to produce more powerful light emissions. Finally, this work is a first step towards making molecule-sized components that combine electronic and optical properties. Similar components could form the basis of a molecular computer.[63]

Polymer light-emitting diodes edit

 
poly(p-phenylene vinylene), used in the first PLED[29]

Polymer light-emitting diodes (PLED, P-OLED), also light-emitting polymers (LEP), involve an electroluminescent conductive polymer that emits light when connected to an external voltage. They are used as a thin film for full-spectrum colour displays. Polymer OLEDs are quite efficient and require a relatively small amount of power for the amount of light produced.

Vacuum deposition is not a suitable method for forming thin films of polymers. If the polymeric OLED films are made by vacuum vapor deposition, the chain elements will be cut off and the original photophysical properties will be compromised. However, polymers can be processed in solution, and spin coating is a common method of depositing thin polymer films. This method is more suited to forming large-area films than thermal evaporation. No vacuum is required, and the emissive materials can also be applied on the substrate by a technique derived from commercial inkjet printing.[64][65] However, as the application of subsequent layers tends to dissolve those already present, formation of multilayer structures is difficult with these methods. The metal cathode may still need to be deposited by thermal evaporation in vacuum. An alternative method to vacuum deposition is to deposit a Langmuir-Blodgett film.

Typical polymers used in PLED displays include derivatives of poly(p-phenylene vinylene) and polyfluorene. Substitution of side chains onto the polymer backbone may determine the colour of emitted light[66] or the stability and solubility of the polymer for performance and ease of processing.[67] While unsubstituted poly(p-phenylene vinylene) (PPV) is typically insoluble, a number of PPVs and related poly(naphthalene vinylene)s (PNVs) that are soluble in organic solvents or water have been prepared via ring opening metathesis polymerization.[68][69][70] These water-soluble polymers or conjugated poly electrolytes (CPEs) also can be used as hole injection layers alone or in combination with nanoparticles like graphene.[71]

Phosphorescent materials edit

 
Ir(mppy)3, a phosphorescent dopant which emits green light[72]
Main article: Phosphorescent organic light-emitting diode

Phosphorescent organic light-emitting diodes use the principle of electrophosphorescence to convert electrical energy in an OLED into light in a highly efficient manner,[73][74] with the internal quantum efficiencies of such devices approaching 100%.[75]

Typically, a polymer such as poly(N-vinylcarbazole) is used as a host material to which an organometallic complex is added as a dopant. Iridium complexes[74] such as Ir(mppy)3[72] as of 2004 were a focus of research, although complexes based on other heavy metals such as platinum[73] have also been used.

The heavy metal atom at the centre of these complexes exhibits strong spin-orbit coupling, facilitating intersystem crossing between singlet and triplet states. By using these phosphorescent materials, both singlet and triplet excitons will be able to decay radiatively, hence improving the internal quantum efficiency of the device compared to a standard OLED where only the singlet states will contribute to emission of light.

Applications of OLEDs in solid state lighting require the achievement of high brightness with good CIE coordinates (for white emission). The use of macromolecular species like polyhedral oligomeric silsesquioxanes (POSS) in conjunction with the use of phosphorescent species such as Ir for printed OLEDs have exhibited brightnesses as high as 10,000 cd/m2.[76]

Device architectures edit

Structure edit

Bottom emission edit

 
a) Bottom-emitting and b) top-emitting OLED structures; c,d) Schematic diagrams based on bottom-emitting and top-emitting OLEDs with low and high contrast ratio, respectively.

The bottom-emission organic light-emitting diode (BE-OLED) is the architecture that was used in the early-stage AMOLED displays. It had a transparent anode fabricated on a glass substrate, and a shiny reflective cathode. Light is emitted from the transparent anode direction. To reflect all the light towards the anode direction, a relatively thick metal cathode such as aluminum is used. For the anode, high-transparency indium tin oxide (ITO) was a typical choice to emit as much light as possible.[77] Organic thin-films, including the emissive layer that actually generates the light, are then sandwiched between the ITO anode and the reflective metal cathode. The downside of bottom emission structure is that the light has to travel through the pixel drive circuits such as the thin film transistor (TFT) substrate, and the area from which light can be extracted is limited and the light emission efficiency is reduced.

Top emission edit

An alternative configuration is to switch the mode of emission. A reflective anode, and a transparent (or more often semi-transparent) cathode are used so that the light emits from the cathode side, and this configuration is called top-emission OLED (TE-OLED). Unlike BEOLEDs where the anode is made of transparent conductive ITO, this time the cathode needs to be transparent, and the ITO material is not an ideal choice for the cathode because of a damage issue due to the sputtering process.[78] Thus, a thin metal film such as pure Ag and the Mg:Ag alloy are used for the semi-transparent cathode due to their high transmittance and high conductivity.[79] In contrast to the bottom emission, light is extracted from the opposite side in top emission without the need of passing through multiple drive circuit layers. Thus, the light generated can be extracted more efficiently.

Improvements edit

Micro-cavity theory edit

 
Sony's Super Top Emission OLED technology enhances the color purity of emitted lights.

When light waves meet while traveling along the same medium, wave interference occurs. This interference can be constructive or destructive. It is sometimes desirable for several waves of the same frequency to sum up into a wave with higher amplitudes.

Since both electrodes are reflective in TEOLED, light reflections can happen within the diode, and they cause more complex interferences than those in BEOLEDs. In addition to the two-beam interference, there exists a multi-resonance interference between two electrodes. Because the structure of TEOLEDs is similar to that of the Fabry-Perot resonator or laser resonator, which contains two parallel mirrors comparable to the two reflective electrodes),[80] this effect is especially strong in TEOLED. This two-beam interference and the Fabry-Perot interferences are the main factors in determining the output spectral intensity of OLED. This optical effect is called the "micro-cavity effect."

In the case of OLED, that means the cavity in a TEOLED could be especially designed to enhance the light output intensity and color purity with a narrow band of wavelengths, without consuming more power. In TEOLEDs, the microcavity effect commonly occurs, and when and how to restrain or make use of this effect is indispensable for device design. To match the conditions of constructive interference, different layer thicknesses are applied according to the resonance wavelength of that specific color. The thickness conditions are carefully designed and engineered according to the peak resonance emitting wavelengths of the blue (460 nm), green (530 nm), and red (610 nm) color LEDs. This technology greatly improves the light-emission efficiency of OLEDs, and are able to achieve a wider color gamut due to high color purity.

Color filters edit

In "white + color filter method", red, green, and blue emissions are obtained from the same white-light LEDs using different color filters.[81] With this method, the OLED materials produce white light, which is then filtered to obtain the desired RGB colors. This method eliminated the need to deposit three different organic emissive materials, so only one kind of OLED material is used to produce white light. It also eliminated the uneven degradation rate of blue pixels vs. red and green pixels. Disadvantages of this method are low color purity and contrast. Also, the filters absorb most of the emitted light, requiring the background white light to be relatively strong to compensate for the drop in brightness, and thus the power consumption for such displays can be higher.

Color filters can also be implemented into bottom- and top-emission OLEDs. By adding the corresponding RGB color filters after the semi-transparent cathode, even purer wavelengths of light can be obtained. The use of a microcavity in top-emission OLEDs with color filters also contributes to an increase in the contrast ratio by reducing the reflection of incident ambient light.[82] In a conventional panel, a circular polarizer was installed on the panel surface. While this was provided to prevent the reflection of ambient light, it also reduced the light output. By replacing this polarizing layer with color filters, the light intensity is not affected, and essentially all ambient reflected light can be cut, allowing a better contrast on the display panel. This potentially reduced the need for brighter pixels and can lower the power consumption.

Other architectures edit

Transparent OLEDs edit

Transparent OLEDs use transparent or semi-transparent contacts on both sides of the device to create displays that can be made to be both top and bottom emitting (transparent). TOLEDs can greatly improve contrast, making it much easier to view displays in bright sunlight.[83] This technology can be used in Head-up displays, smart windows or augmented reality applications.

Graded heterojunction edit

Graded heterojunction OLEDs gradually decrease the ratio of electron holes to electron transporting chemicals.[44] This results in almost double the quantum efficiency of existing OLEDs.

Stacked OLEDs edit

Stacked OLEDs use a pixel architecture that stacks the red, green, and blue subpixels on top of one another instead of next to one another, leading to substantial increase in gamut and color depth,[84] and greatly reducing pixel gap. Other display technologies with RGB (and RGBW) pixels mapped next to each other, tend to decrease potential resolution.

Inverted OLED edit

In contrast to a conventional OLED, in which the anode is placed on the substrate, an inverted OLED uses a bottom cathode that can be connected to the drain end of an n-channel TFT, especially for the low-cost amorphous silicon TFT backplane useful in the manufacturing of AMOLED displays.[85]

All OLED displays (passive and active matrix) use a driver IC, often mounted using the chip-on-glass (COG) technology with an anisotropic conductive film.[86]

Color patterning technologies edit

Shadow mask patterning method edit

The most commonly used patterning method for organic light-emitting displays is shadow masking during film deposition,[87] also called the "RGB side-by-side" method or "RGB pixelation" method. Metal sheets with multiple apertures made of low thermal expansion material, such as nickel alloy, are placed between the heated evaporation source and substrate, so that the organic or inorganic material from the evaporation source is masked off, or blocked by the sheet from reaching the substrate in most locations, so the materials are deposited only on the desired locations on the substrate, and the rest is deposited and remains on the sheet. Almost all small OLED displays for smartphones have been manufactured using this method. Fine metal masks (FMMs) made by photochemical machining, reminiscent of old CRT shadow masks, are used in this process. The dot density of the mask will determine the pixel density of the finished display.[88] Fine Hybrid Masks (FHMs) are lighter than FFMs, reducing bending caused by the mask's own weight, and are made using an electroforming process.[89][90] This method requires heating the electroluminescent materials at 300 °C using a thermal method in a high vacuum of 10−5 Pa. An oxygen meter ensures that no oxygen enters the chamber as it could damage (through oxidation) the electroluminescent material, which is in powder form. The mask is aligned with the mother substrate before every use, and it is placed just below the substrate. The substrate and mask assembly are placed at the top of the deposition chamber.[91] Afterwards, the electrode layer is deposited, by subjecting silver and aluminum powder to 1000 °C, using an electron beam.[92] Shadow masks allow for high pixel densities of up to 2,250 DPI (890 dot/cm). High pixel densities are necessary for virtual reality headsets.[93]

White + color filter method edit

Although the shadow-mask patterning method is a mature technology used from the first OLED manufacturing, it causes many issues like dark spot formation due to mask-substrate contact or misalignment of the pattern due to the deformation of shadow mask. Such defect formation can be regarded as trivial when the display size is small, however it causes serious issues when a large display is manufactured, which brings significant production yield loss. To circumvent such issues, white emission devices with 4-sub-pixel color filters (white, red, green and blue) have been used for large televisions. In spite of the light absorption by the color filter, state-of-the-art OLED televisions can reproduce color very well, such as 100% NTSC, and consume little power at the same time. This is done by using an emission spectrum with high human-eye sensitivity, special color filters with a low spectrum overlap, and performance tuning with color statistics into consideration.[94] This approach is also called the "Color-by-white" method.

Other color patterning approaches edit

There are other types of emerging patterning technologies to increase the manufacturability of OLEDs. Patternable organic light-emitting devices use a light or heat activated electroactive layer. A latent material (PEDOT-TMA) is included in this layer that, upon activation, becomes highly efficient as a hole injection layer. Using this process, light-emitting devices with arbitrary patterns can be prepared.[95]

Colour patterning can be accomplished by means of a laser, such as a radiation-induced sublimation transfer (RIST).[96]

Organic vapour jet printing (OVJP) uses an inert carrier gas, such as argon or nitrogen, to transport evaporated organic molecules (as in organic vapour phase deposition). The gas is expelled through a micrometre-sized nozzle or nozzle array close to the substrate as it is being translated. This allows printing arbitrary multilayer patterns without the use of solvents.

Like ink jet material deposition, inkjet etching (IJE) deposits precise amounts of solvent onto a substrate designed to selectively dissolve the substrate material and induce a structure or pattern. Inkjet etching of polymer layers in OLED's can be used to increase the overall out-coupling efficiency. In OLEDs, light produced from the emissive layers of the OLED is partially transmitted out of the device and partially trapped inside the device by total internal reflection (TIR). This trapped light is wave-guided along the interior of the device until it reaches an edge where it is dissipated by either absorption or emission. Inkjet etching can be used to selectively alter the polymeric layers of OLED structures to decrease overall TIR and increase out-coupling efficiency of the OLED. Compared to a non-etched polymer layer, the structured polymer layer in the OLED structure from the IJE process helps to decrease the TIR of the OLED device. IJE solvents are commonly organic instead of water-based due to their non-acidic nature and ability to effectively dissolve materials at temperatures under the boiling point of water.[97]

Transfer-printing is an emerging technology to assemble large numbers of parallel OLED and AMOLED devices efficiently. It takes advantage of standard metal deposition, photolithography, and etching to create alignment marks commonly on glass or other device substrates. Thin polymer adhesive layers are applied to enhance resistance to particles and surface defects. Microscale ICs are transfer-printed onto the adhesive surface and then baked to fully cure adhesive layers. An additional photosensitive polymer layer is applied to the substrate to account for the topography caused by the printed ICs, reintroducing a flat surface. Photolithography and etching removes some polymer layers to uncover conductive pads on the ICs. Afterwards, the anode layer is applied to the device backplane to form the bottom electrode. OLED layers are applied to the anode layer with conventional vapor deposition, and covered with a conductive metal electrode layer. As of 2011 transfer-printing was capable to print onto target substrates up to 500 mm × 400 mm. This size limit needs to expand for transfer-printing to become a common process for the fabrication of large OLED/AMOLED displays.[98]

Experimental OLED displays using conventional photolithography techniques instead of FMMs have been demonstrated, allowing for large substrate sizes (as it eliminates the need for a mask that needs to be as large as the substrate) and good yield control.[99]

Thin-film transistor backplanes edit

For a high resolution display like a TV, a thin-film transistor (TFT) backplane is necessary to drive the pixels correctly. As of 2019, low-temperature polycrystalline silicon (LTPS) – TFT is widely used for commercial AMOLED displays. LTPS-TFT has variation of the performance in a display, so various compensation circuits have been reported.[100] Due to the size limitation of the excimer laser used for LTPS, the AMOLED size was limited. To cope with the hurdle related to the panel size, amorphous-silicon/microcrystalline-silicon backplanes have been reported with large display prototype demonstrations.[101] An indium gallium zinc oxide (IGZO) backplane can also be used.

Advantages edit

Further information: Comparison of CRT, LCD, plasma, and OLED displays

The different manufacturing process of OLEDs has several advantages over flat panel displays made with LCD technology.

Lower cost in the future
OLEDs can be printed onto any suitable substrate by an inkjet printer or even by screen printing,[102] theoretically making them cheaper to produce than LCD or plasma displays. However, fabrication of the OLED substrate as of 2018 is costlier than that for TFT LCDs.[103] Roll-to-roll vapor-deposition methods for organic devices do allow mass production of thousands of devices per minute for minimal cost; however, this technique also induces problems: devices with multiple layers can be challenging to make because of registration — lining up the different printed layers to the required degree of accuracy.
Lightweight and flexible plastic substrates
OLED displays can be fabricated on flexible plastic substrates, leading to the possible fabrication of flexible organic light-emitting diodes for other new applications, such as roll-up displays embedded in fabrics or clothing. If a substrate like polyethylene terephthalate (PET)[104] can be used, the displays may be produced inexpensively. Furthermore, plastic substrates are shatter-resistant, unlike the glass displays used in LCD devices.
Better picture quality
OLEDs enable a greater contrast ratio and wider viewing angle compared to LCDs, because OLED pixels emit light directly. This also provides a deeper black level, since a black OLED display emits no light. Furthermore, OLED pixel colors appear correct and unshifted, even as the viewing angle approaches 90° from the normal.
Better power efficiency
LCDs filter the light emitted from a backlight, allowing a small fraction of light through. Thus, they cannot show true black. However, an inactive OLED element does not produce light or consume power, allowing true blacks.[105] Removing the backlight also makes OLEDs lighter because some substrates are not needed.
Response time
OLEDs also have a much faster response time than an LCD. Using response time compensation technologies, the fastest modern LCDs can reach response times as low as 1 ms for their fastest color transition, and are capable of refresh frequencies as high as 240 Hz. According to LG, OLED response times are up to 1,000 times faster than LCD,[106] putting conservative estimates at under 10 μs (0.01 ms), which could theoretically accommodate refresh frequencies approaching 100 kHz (100,000 Hz). Due to their extremely fast response time, OLED displays can also be easily designed to be strobed, creating an effect similar to CRT flicker in order to avoid the sample-and-hold behavior seen on both LCDs and some OLED displays, which creates the perception of motion blur.[107]

Disadvantages edit

 
Light-emitting polymer (LEP) display showing partial failure
 
An old OLED display showing wear

Lifespan edit

The biggest technical problem for OLEDs is the limited lifetime of the organic materials. One 2008 technical report on an OLED TV panel found that after 1,000 hours, the blue luminance degraded by 12%, the red by 7% and the green by 8%.[108] In particular, blue OLEDs at that time had a lifetime of around 14,000 hours to half original brightness (five years at eight hours per day) when used for flat-panel displays. This is lower than the typical lifetime of LCD, LED or PDP technology; each rated for about 25,000–40,000 hours to half brightness, depending on manufacturer and model. One major challenge for OLED displays is the formation of dark spots due to the ingress of oxygen and moisture, which degrades the organic material over time whether or not the display is powered.[109][110][111] In 2016, LG Electronics reported an expected lifetime of 100,000 hours, up from 36,000 hours in 2013.[112] A US Department of Energy paper shows that the expected lifespans of OLED lighting products goes down with increasing brightness, with an expected lifespan of 40,000 hours at 25% brightness, or 10,000 hours at 100% brightness.[113][114]

Cause of degradation edit

Degradation occurs because of the accumulation of nonradiative recombination centers and luminescence quenchers in the emissive zone. It is said that the chemical breakdown in the semiconductors occurs in four steps:

  1. recombination[a] of charge carriers through the absorption of UV light
  2. homolytic dissociation
  3. subsequent radical addition reactions that form π radicals
  4. disproportionation between two radicals resulting in hydrogen-atom transfer reactions[115]

However, some manufacturers' displays aim to increase the lifespan of OLED displays, pushing their expected life past that of LCD displays by improving light outcoupling, thus achieving the same brightness at a lower drive current.[116][117] In 2007, experimental OLEDs were created which can sustain 400 cd/m2 of luminance for over 198,000 hours for green OLEDs and 62,000 hours for blue OLEDs.[118] In 2012, OLED lifetime to half of the initial brightness was improved to 900,000 hours for red, 1,450,000 hours for yellow and 400,000 hours for green at an initial luminance of 1,000 cd/m2.[119] Proper encapsulation is critical for prolonging an OLED display's lifetime, as the OLED light emitting electroluminescent materials are sensitive to oxygen and moisture. When exposed to moisture or oxygen, the electroluminescent materials in OLEDs degrade as they oxidize, generating black spots and reducing or shrinking the area that emits light, reducing light output. This reduction can occur in a pixel by pixel basis. This can also lead to delamination of the electrode layer, eventually leading to complete panel failure.

Degradation occurs three orders of magnitude faster when exposed to moisture than when exposed to oxygen. Encapsulation can be performed by applying an epoxy adhesive with dessicant,[120] by laminating a glass sheet with epoxy glue and dessicant[121] followed by vacuum degassing, or by using Thin-Film Encapsulation (TFE), which is a multi-layer coating of alternating organic and inorganic layers. The organic layers are applied using inkjet printing, and the inorganic layers are applied using Atomic Layer Deposition (ALD). The encapsulation process is carried out under a nitrogen environment, using UV-curable LOCA glue and the electroluminescent and electrode material deposition processes are carried out under a high vacuum. The encapsulation and material deposition processes are carried out by a single machine, after the Thin-film transistors have been applied. The transistors are applied in a process that is the same for LCDs. The electroluminescent materials can also be applied using inkjet printing.[122][123][124][92][125][120][126]

Color balance edit

The OLED material used to produce blue light degrades much more rapidly than the materials used to produce other colors; in other words, blue light output will decrease relative to the other colors of light. This variation in the differential color output will change the color balance of the display, and is much more noticeable than a uniform decrease in overall luminance.[127] This can be avoided partially by adjusting the color balance, but this may require advanced control circuits and input from a knowledgeable user. More commonly, though, manufacturers optimize the size of the R, G and B subpixels to reduce the current density through the subpixel in order to equalize lifetime at full luminance. For example, a blue subpixel may be 75% larger than the green subpixel. The red subpixel may be 10% larger than the green.

Efficiency of blue OLEDs edit

Improvements to the efficiency and lifetime of blue OLEDs is vital to the success of OLEDs as replacements for LCD technology. Considerable research has been invested in developing blue OLEDs with high external quantum efficiency, as well as a deeper blue color.[128][129][130]

Since 2012, research focuses on organic materials exhibiting thermally activated delayed fluorescence (TADF), discovered at Kyushu University OPERA and UC Santa Barbara CPOS. TADF would allow stable and high-efficiency solution processable (meaning that the organic materials are layered in solutions producing thinner layers) blue emitters, with internal quantum efficiencies reaching 100%.[131] Early in 2017,[55] TADF materials based on oxygen-based fully bridged boron-type electron accepttors had achieved huge breakthrough in their proprities. The external quantum efficiency of TADF-OLED for blue and green light had achieved 38%, with thin full-width half-maximum and high color purity. In 2022, Han et al.[132] synthesized a new D-A type luminescent material, TDBA-Cz, and used the m-AC-DBNA synthesized by Meng et al. as a control to investigate the effect of the substitution site of the carbazole unit as an electron donor on the oxygen-bridged triphenylboron electron acceptor unit on the photophysical properties of the overall molecule. It was found that the introduction of two carbazole units into the same benzene ring of the oxygen-bridged triphenylboron electron acceptor unit could effectively suppress the conformational relaxation of the molecule during the radiative transition, resulting in narrow bandwidth blue light emission. In addition, TDBA-Cz is the first reported blue material to achieve both a FWHM down to 45 nm and a maximum EQE of 21.4% in a non-doped TADF-OLED.

Blue TADF emitters are expected to market by 2020[133][134] and would be used for WOLED displays with phosphorescent color filters, as well as blue OLED displays with ink-printed QD color filters.

Water damage edit

Water can instantly damage the organic materials of the displays. Therefore, improved sealing processes are important for practical manufacturing. Water damage especially may limit the longevity of more flexible displays.[135]

Outdoor performance edit

As an emissive display technology, OLEDs rely completely upon converting electricity to light, unlike most LCDs which are to some extent reflective. E-paper leads the way in efficiency with ~ 33% ambient light reflectivity, enabling the display to be used without any internal light source. The metallic cathode in an OLED acts as a mirror, with reflectance approaching 80%, leading to poor readability in bright ambient light such as outdoors. However, with the proper application of a circular polarizer and antireflective coatings, the diffuse reflectance can be reduced to less than 0.1%. With 10,000 fc incident illumination (typical test condition for simulating outdoor illumination), that yields an approximate photopic contrast of 5:1. Advances in OLED technologies, however, enable OLEDs to become actually better than LCDs in bright sunlight. The AMOLED display in the Galaxy S5, for example, was found to outperform all LCD displays on the market in terms of power usage, brightness and reflectance.[136]

Power consumption edit

While an OLED will consume around 40% of the power of an LCD displaying an image that is primarily black, for the majority of images it will consume 60–80% of the power of an LCD. However, an OLED can use more than 300% power to display an image with a white background, such as a document or web site.[137] This can lead to reduced battery life in mobile devices when white backgrounds are used.

Screen flicker edit

Many OLEDs use pulse width modulation to display colour/brightness gradations. For example, a pixel instructed to display gray will flicker on and off rapidly, creating a subtle strobe effect.[138] The alternative way to decrease brightness would be to decrease power to the display, which would eliminate screen flicker to the detriment of colour balance, which deteriorates as brightness decreases. However, use of PWM gradations may be more harmful for eye health.[139]

Manufacturers and commercial uses edit

 
Magnified image of the AMOLED screen on the Google Nexus One smartphone using the RGBG system of the PenTile Matrix Family
 
A 3.8 cm (1.5 in) OLED display from a Creative ZEN V media player
 
OLED lighting in a shopping mall in Aachen, Germany

Almost all OLED manufacturers rely on material deposition equipment that is only made by a handful of companies,[140] the most notable one being Canon Tokki, a unit of Canon Inc. Canon Tokki is reported to have a near-monopoly of the giant OLED-manufacturing vacuum machines, notable for their 100-metre (330 ft) size.[141] Apple has relied solely on Canon Tokki in its bid to introduce its own OLED displays for the iPhones released in 2017.[142] The electroluminescent materials needed for OLEDs are also made by a handful of companies, some of them being Merck, Universal Display Corporation and LG Chem.[143] The machines that apply these materials can operate continuously for 5–6 days, and can process a mother substrate in 5 minutes.[144]

OLED technology is used in commercial applications such as displays for mobile phones and portable digital media players, car radios and digital cameras among others, as well as lighting.[145] Such portable display applications favor the high light output of OLEDs for readability in sunlight and their low power drain. Portable displays are also used intermittently, so the lower lifespan of organic displays is less of an issue. Prototypes have been made of flexible and rollable displays which use OLEDs' unique characteristics. Applications in flexible signs and lighting are also being developed.[146] OLED lighting offers several advantages over LED lighting, such as higher quality illumination, more diffuse light source, and panel shapes.[145] Philips Lighting has made OLED lighting samples under the brand name "Lumiblade" available online[147] and Novaled AG based in Dresden, Germany, introduced a line of OLED desk lamps called "Victory" in September, 2011.[148]

Nokia introduced OLED mobile phones including the N85 and the N86 8MP, both of which feature an AMOLED display. OLEDs have also been used in most Motorola and Samsung color cell phones, as well as some HTC, LG and Sony Ericsson models.[149] OLED technology can also be found in digital media players such as the Creative ZEN V, the iriver clix, the Zune HD and the Sony Walkman X Series.

The Google and HTC Nexus One smartphone includes an AMOLED screen, as does HTC's own Desire and Legend phones. However, due to supply shortages of the Samsung-produced displays, certain HTC models will use Sony's SLCD displays in the future,[150] while the Google and Samsung Nexus S smartphone will use "Super Clear LCD" instead in some countries.[151]

OLED displays were used in watches made by Fossil (JR-9465) and Diesel (DZ-7086). Other manufacturers of OLED panels include Anwell Technologies Limited (Hong Kong),[152] AU Optronics (Taiwan),[153] Chimei Innolux Corporation (Taiwan),[154] LG (Korea),[155] and others.[156]

DuPont stated in a press release in May 2010, that they can produce a 50-inch OLED TV in two minutes with a new printing technology. If this can be scaled up in terms of manufacturing, then the total cost of OLED TVs would be greatly reduced. DuPont also states that OLED TVs made with this less expensive technology can last up to 15 years if left on for a normal eight-hour day.[157][158]

The use of OLEDs may be subject to patents held by Universal Display Corporation, Eastman Kodak, DuPont, General Electric, Royal Philips Electronics, numerous universities and others.[159] By 2008, thousands of patents associated with OLEDs, came from larger corporations and smaller technology companies.[41]

Flexible OLED displays have been used by manufacturers to create curved displays such as the Galaxy S7 Edge but they were not in devices that can be flexed by the users.[160] Samsung demonstrated a roll-out display in 2016.[161]

 
 
Samsung foldable smartphones

On 31 October 2018, Royole, a Chinese electronics company, unveiled the world's first foldable screen phone featuring a flexible OLED display.[162] On 20 February 2019, Samsung announced the Samsung Galaxy Fold with a foldable OLED display from Samsung Display, its majority-owned subsidiary.[163] At MWC 2019 on 25 February 2019, Huawei announced the Huawei Mate X featuring a foldable OLED display from BOE.[164][165]

The 2010s also saw the wide adoption of tracking gate-line in pixel (TGP), which moves the driving circuitry from the borders of the display to in between the display's pixels, allowing for narrow bezels.[166]

In 2023 the German startup Inuru has announced to manufacture low-cost OLED with printing for packaging and fashion applications. [167]

Fashion edit

Textiles incorporating OLEDs are an innovation in the fashion world and pose for a way to integrate lighting to bring inert objects to a whole new level of fashion. The hope is to combine the comfort and low cost properties of textile with the OLEDs properties of illumination and low energy consumption. Although this scenario of illuminated clothing is highly plausible, challenges are still a road block. Some issues include: the lifetime of the OLED, rigidness of flexible foil substrates, and the lack of research in making more fabric like photonic textiles.[168]

Automotive edit

The number of automakers using OLEDs is still rare and limited to the high-end of the market. For example, the 2010 Lexus RX features an OLED display instead of a thin film transistor (TFT-LCD) display.

A Japanese manufacturer Pioneer Electronic Corporation produced the first car stereos with a monochrome OLED display, which was also the world's first OLED product.[169] The Aston Martin DB9 incorporated the world's first automotive OLED display,[170] which was manufactured by Yazaki,[171] followed by the 2004 Jeep Grand Cherokee and the Chevrolet Corvette C6.[172] The 2015 Hyundai Sonata and Kia Soul EV use a 3.5-inch white PMOLED display.

Company-specific applications edit

Samsung edit

 
Samsung AMOLED displays

By 2004, Samsung Display, a subsidiary of South Korea's largest conglomerate and a former Samsung-NEC joint venture, was the world's largest OLED manufacturer, producing 40% of the OLED displays made in the world,[173] and as of 2010, has a 98% share of the global AMOLED market.[174] The company is leading the world of OLED industry, generating $100.2 million out of the total $475 million revenues in the global OLED market in 2006.[175] As of 2006, it held more than 600 American patents and more than 2800 international patents, making it the largest owner of AMOLED technology patents.[175]

Samsung SDI announced in 2005, the world's largest OLED TV at the time, at 21 inches (53 cm).[176] This OLED featured the highest resolution at the time, of 6.22 million pixels. In addition, the company adopted active matrix-based technology for its low power consumption and high-resolution qualities. This was exceeded in January 2008, when Samsung showcased the world's largest and thinnest OLED TV at the time, at 31 inches (78 cm) and 4.3 mm.[177]

In May 2008, Samsung unveiled an ultra-thin 12.1 inch (30 cm) laptop OLED display concept, with a 1,280×768 resolution with infinite contrast ratio.[178] According to Woo Jong Lee, Vice President of the Mobile Display Marketing Team at Samsung SDI, the company expected OLED displays to be used in notebook PCs as soon as 2010.[179]

In October 2008, Samsung showcased the world's thinnest OLED display, also the first to be "flappable" and bendable.[180] It measures just 0.05 mm (thinner than paper), yet a Samsung staff member said that it is "technically possible to make the panel thinner".[180] To achieve this thickness, Samsung etched an OLED panel that uses a normal glass substrate. The drive circuit was formed by low-temperature polysilicon TFTs. Also, low-molecular organic EL materials were employed. The pixel count of the display is 480 × 272. The contrast ratio is 100,000:1, and the luminance is 200 cd/m2. The colour reproduction range is 100% of the NTSC standard.

As of 2020, the world's largest OLED television is an 88-inch with an 8K resolution, frame rate up to 120 fps and cost of 34,676 US Dollars.[181]

At the Consumer Electronics Show (CES) in January 2010, Samsung demonstrated a laptop computer with a large, transparent OLED display featuring up to 40% transparency[182] and an animated OLED display in a photo ID card.[183]

Samsung's 2010 AMOLED smartphones used their Super AMOLED trademark, with the Samsung Wave S8500 and Samsung i9000 Galaxy S being launched in June 2010. In January 2011, Samsung announced their Super AMOLED Plus displays, which offer several advances over the older Super AMOLED displays: real stripe matrix (50% more sub pixels), thinner form factor, brighter image and an 18% reduction in energy consumption.[184]

At CES 2012, Samsung introduced the first 55" TV screen that uses Super OLED technology.[185]

On 8 January 2013, at CES Samsung unveiled a unique curved 4K Ultra S9 OLED television, which they state provides an "IMAX-like experience" for viewers.[186]

On 13 August 2013, Samsung announced availability of a 55-inch curved OLED TV (model KN55S9C) in the US at a price point of $8999.99.[187]

On 6 September 2013, Samsung launched its 55-inch curved OLED TV (model KE55S9C) in the United Kingdom with John Lewis.[188]

Samsung introduced the Galaxy Round smartphone in the Korean market in October 2013. The device features a 1080p screen, measuring 5.7 inches (14 cm), that curves on the vertical axis in a rounded case. The corporation has promoted the following advantages: A new feature called "Round Interaction" that allows users to look at information by tilting the handset on a flat surface with the screen off, and the feel of one continuous transition when the user switches between home screens.[189]

Samsung released a new line of OLED TVs in 2022, its first using the technology since 2013.[190] They use panels sourced from Samsung Display; previously, LG was the sole manufacturer of OLED panels for TVs.[191]

Sony edit

 
Sony XEL-1, the world's first OLED TV[36] (front)

The Sony CLIÉ PEG-VZ90 was released in 2004, being the first PDA to feature an OLED screen.[192] Other Sony products to feature OLED screens include the MZ-RH1 portable minidisc recorder, released in 2006[193] and the Walkman X Series.[194]

At the 2007, Las Vegas Consumer Electronics Show (CES), Sony showcased a 11-inch (28 cm), (resolution 960×540) and 27-inch (69 cm), full HD resolution at 1920 × 1080 OLED TV models.[195] Both claimed 1,000,000:1 contrast ratios and total thicknesses (including bezels) of 5 mm. In April 2007, Sony announced it would manufacture 1000 11-inch (28 cm) OLED TVs per month for market testing purposes.[196] On 1 October 2007, Sony announced that the 11-inch (28 cm) model XEL-1, was the first commercial OLED TV[36] and it was released in Japan in December 2007.[197]

In May 2007, Sony publicly unveiled a video of a 2.5-inch (6.4 cm) flexible OLED screen which is only 0.3 millimeters thick.[198] At the Display 2008 exhibition, Sony demonstrated a 0.2 mm thick 3.5 inches (8.9 cm) display with a resolution of 320×200 pixels and a 0.3 mm thick 11-inch (28 cm) display with 960×540 pixels resolution, one-tenth the thickness of the XEL-1.[199][200]

In July 2008, a Japanese government body said it would fund a joint project of leading firms, which is to develop a key technology to produce large, energy-saving organic displays. The project involves one laboratory and 10 companies including Sony Corp. NEDO said the project was aimed at developing a core technology to mass-produce 40 inch or larger OLED displays in the late 2010s.[201]

In October 2008, Sony published results of research it carried out with the Max Planck Institute over the possibility of mass-market bending displays, which could replace rigid LCDs and plasma screens. Eventually, bendable, see-through displays could be stacked to produce 3D images with much greater contrast ratios and viewing angles than existing products.[202]

Sony exhibited a 24.5" (62 cm) prototype OLED 3D television during the Consumer Electronics Show in January 2010.[203]

In January 2011, Sony announced the PlayStation Vita handheld game console (the successor to the PSP) will feature a 5-inch OLED screen.[204]

On 17 February 2011, Sony announced its 25" (63.5 cm) OLED Professional Reference Monitor aimed at the Cinema and high end Drama Post Production market.[205]

On 25 June 2012, Sony and Panasonic announced a joint venture for creating low cost mass production OLED televisions by 2013.[206] Sony unveiled its first OLED TV since 2008 at CES 2017 called A1E. It revealed two other models in 2018 one at CES 2018 called A8F and other a Master Series TV called A9F. At CES 2019 they unveiled another two models one the A8G and the other another Bravia Series TV called A9G. Then, at CES 2020, they revealed the A8H, which was effectively an A9G in terms of picture quality but with some compromises due to its lower cost. At the same event, they also revealed a 48-inch version of the A9G, making this its smallest OLED TV since the XEL-1.[207][208][209][210]

LG edit

On 9 April 2009, LG acquired Kodak's OLED business and started to utilize white OLED technology.[211][212] As of 2010, LG Electronics produced one model of OLED television, the 15-inch (38 cm) 15EL9500[213] and had announced a 31-inch (79 cm) OLED 3D television for March 2011.[214] On 26 December 2011, LG officially announced the "world's largest 55-inch (140 cm) OLED panel" and featured it at CES 2012.[215] In late 2012, LG announces the launch of the 55EM9600 OLED television in Australia.[216]

In January 2015, LG Display signed a long-term agreement with Universal Display Corporation for the supply of OLED materials and the right to use their patented OLED emitters.[217]

Mitsubishi edit

Lumiotec is the first company in the world developing and selling, since January 2011, mass-produced OLED lighting panels with such brightness and long lifetime. Lumiotec is a joint venture of Mitsubishi Heavy Industries, ROHM, Toppan Printing, and Mitsui & Co. On 1 June 2011, Mitsubishi Electric installed a 6-meter OLED 'sphere' in Tokyo's Science Museum.[218]

Recom Group edit

On 6 January 2011, Los Angeles-based technology company Recom Group introduced the first small screen consumer application of the OLED at the Consumer Electronics Show in Las Vegas. This was a 2.8" (7 cm) OLED display being used as a wearable video name tag.[219] At the Consumer Electronics Show in 2012, Recom Group introduced the world's first video mic flag incorporating three 2.8" (7 cm) OLED displays on a standard broadcaster's mic flag. The video mic flag allowed video content and advertising to be shown on a broadcasters standard mic flag.[220]

Dell edit

On 6 January 2016, Dell announced the Ultrasharp UP3017Q OLED monitor at the Consumer Electronics Show in Las Vegas.[221] The monitor was announced to feature a 30-inch (76 cm) 4K UHD OLED panel with a 120 Hz refresh rate, 0.1 millisecond response time, and a contrast ratio of 400,000:1. The monitor was set to sell at a price of $4,999 and release in March, 2016, just a few months later. As the end of March rolled around, the monitor was not released to the market and Dell did not speak on reasons for the delay. Reports suggested that Dell canceled the monitor as the company was unhappy with the image quality of the OLED panel, especially the amount of color drift that it displayed when you viewed the monitor from the sides.[222] On 13 April 2017, Dell finally released the UP3017Q OLED monitor to the market at a price of $3,499 ($1,500 less than its original spoken price of $4,999 at CES 2016). In addition to the price drop, the monitor featured a 60 Hz refresh rate and a contrast ratio of 1,000,000:1. As of June, 2017, the monitor is no longer available to purchase from Dell's website.

Apple edit

Apple began using OLED panels in its watches in 2015 and in its laptops in 2016 with the introduction of an OLED touchbar to the MacBook Pro.[223] In 2017, Apple announced the introduction of their tenth anniversary iPhone X with their own optimized OLED display licensed from Universal Display Corporation.[224] With the exception of the iPhone SE line, iPhone XR and iPhone 11 all iPhones released since then have also featured OLED displays.

Nintendo edit

A third model of Nintendo's Switch, a hybrid gaming system, features an OLED panel in place of the original model's LCD panel. Announced in the summer of 2021, it was released on 8 October 2021.[225]

Research edit

In 2014, Mitsubishi Chemical Corporation (MCC), a subsidiary of Mitsubishi Chemical Holdings, developed an OLED panel with a 30,000-hour life, twice that of conventional OLED panels.[226]

The search for efficient OLED materials has been extensively supported by simulation methods; it is possible to calculate important properties computationally, independent of experimental input,[227][228] making materials development cheaper.

On 18 October 2018, Samsung showed of their research roadmap at their 2018 Samsung OLED Forum. This included Fingerprint on Display (FoD), Under Panel Sensor (UPS), Haptic on Display (HoD) and Sound on Display (SoD).[229]

Various venders are also researching cameras under OLEDs (Under Display Cameras). According to IHS Markit Huawei has partnered with BOE, Oppo with China Star Optoelectronics Technology (CSOT), Xiaomi with Visionox.[230]

In 2020, researchers at the Queensland University of Technology (QUT) proposed using human hair which is a source of carbon and nitrogen to create OLED displays.[231]

See also edit

Notes edit

  1. ^ The energy absorbed by a material is released in the form of photons. Generally these photons contain the same or less energy than those initially absorbed. This effect is how LEDs create light.

References edit

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Further reading edit

  • T. Tsujimura, OLED Display Fundamentals and Applications, Wiley-SID Series in Display Technology, New York (2017). ISBN 978-1-119-18731-8.
  • P. Chamorro-Posada, J. Martín-Gil, P. Martín-Ramos, L.M. Navas-Gracia, Fundamentos de la Tecnología OLED (Fundamentals of OLED Technology). University of Valladolid, Spain (2008). ISBN 978-84-936644-0-4. Available online, with permission from the authors, at the webpage: Fundamentos de la Tecnología OLED
  • Kordt, Pascal; et al. (2015). "Modeling of Organic Light Emitting Diodes: From Molecular to Device Properties". Advanced Functional Materials. 25 (13): 1955–1971. doi:10.1002/adfm.201403004. hdl:21.11116/0000-0001-6CD1-A. S2CID 18575622.
  • Shinar, Joseph (Ed.), Organic Light-Emitting Devices: A Survey. NY: Springer-Verlag (2004). ISBN 0-387-95343-4.
  • Hari Singh Nalwa (Ed.), Handbook of Luminescence, Display Materials and Devices, Volume 1–3. American Scientific Publishers, Los Angeles (2003). ISBN 1-58883-010-1. Volume 1: Organic Light-Emitting Diodes
  • Hari Singh Nalwa (Ed.), Handbook of Organic Electronics and Photonics, Volume 1–3. American Scientific Publishers, Los Angeles (2008). ISBN 1-58883-095-0.
  • Müllen, Klaus (Ed.), Organic Light Emitting Devices: Synthesis, Properties and Applications. Wiley-VCH (2006). ISBN 3-527-31218-8
  • Yersin, Hartmut (Ed.), Highly Efficient OLEDs with Phosphorescent Materials. Wiley-VCH (2007). ISBN 3-527-40594-1
  • Kho, Mu-Jeong, Javed, T., Mark, R., Maier, E., and David, C. (2008) 'Final Report: OLED Solid State Lighting – Kodak European Research' MOTI (Management of Technology and Innovation) Project, Judge Business School of the University of Cambridge and Kodak European Research, Final Report presented on 4 March 2008 at Kodak European Research at Cambridge Science Park, Cambridge, UK., pages 1–12.
  • Display, New Vision (12 February 2018). "Between cut-throat competition, Which is better OLED, LCD or PMOLED".

External links edit

 
Wikimedia Commons has media related to OLED.
  • OLED, LCD & TFT - Construction and Difference, advantages and disadvantages 08. Juli 2020
  • Structure and working principle of OLEDs and electroluminescent displays
  • MIT introduction to OLED technology (video)
  • Historical list of OLED products from 1996 to present

February 15, 2024
oled, organic, light, emitting, diode, also, known, organic, electroluminescent, organic, diode, type, light, emitting, diode, which, emissive, electroluminescent, layer, organic, compound, film, that, emits, light, response, electric, current, this, organic, . An organic light emitting diode OLED also known as organic electroluminescent organic EL diode 1 2 is a type of light emitting diode LED in which the emissive electroluminescent layer is an organic compound film that emits light in response to an electric current This organic layer is situated between two electrodes typically at least one of these electrodes is transparent OLEDs are used to create digital displays in devices such as television screens computer monitors and portable systems such as smartphones and handheld game consoles A major area of research is the development of white OLED devices for use in solid state lighting applications 3 4 5 Organic light emitting diodePrototype OLED lighting panelsTypeLEDThere are two main families of OLED those based on small molecules and those employing polymers Adding mobile ions to an OLED creates a light emitting electrochemical cell LEC which has a slightly different mode of operation An OLED display can be driven with a passive matrix PMOLED or active matrix AMOLED control scheme In the PMOLED scheme each row and line in the display is controlled sequentially one by one 6 whereas AMOLED control uses a thin film transistor TFT backplane to directly access and switch each individual pixel on or off allowing for higher resolution and larger display sizes OLED is fundamentally different from LED which is based on a p n diode structure In LEDs doping is used to create p and n regions by changing the conductivity of the host semiconductor OLEDs do not employ a p n structure Doping of OLEDs is used to increase radiative efficiency by direct modification of the quantum mechanical optical recombination rate Doping is additionally used to determine the wavelength of photon emission 7 An OLED display works without a backlight because it emits its own visible light Thus it can display deep black levels and can be thinner and lighter than a liquid crystal display LCD In low ambient light conditions such as a dark room an OLED screen can achieve a higher contrast ratio than an LCD regardless of whether the LCD uses cold cathode fluorescent lamps or an LED backlight OLED displays are made in the same way as LCDs including manufacturing of several displays on a mother substrate that is later thinned and cut into several displays and comes in the same sizes as those used for manufacturing LCDs but after TFT for active matrix displays addressable grid for passive matrix displays or indium tin oxide ITO segment for segment displays formation the display is coated with hole injection transport and blocking layers as well with electroluminescent material after the first 2 layers after which ITO or metal may be applied again as a cathode and later the entire stack of materials is encapsulated The TFT layer addressable grid or ITO segments serve as or are connected to the anode which may be made of ITO or metal 8 9 OLEDs can be made flexible and transparent with transparent displays being used in smartphones with optical fingerprint scanners and flexible displays being used in foldable smartphones Contents 1 History 1 1 Practical OLEDs 2 Working principle 3 Carrier balance 4 Material technologies 4 1 Small molecules 4 2 Polymer light emitting diodes 4 3 Phosphorescent materials 5 Device architectures 5 1 Structure 5 1 1 Bottom emission 5 1 2 Top emission 5 2 Improvements 5 2 1 Micro cavity theory 5 2 2 Color filters 5 3 Other architectures 5 3 1 Transparent OLEDs 5 3 2 Graded heterojunction 5 3 3 Stacked OLEDs 5 3 4 Inverted OLED 6 Color patterning technologies 6 1 Shadow mask patterning method 6 2 White color filter method 6 3 Other color patterning approaches 7 Thin film transistor backplanes 8 Advantages 9 Disadvantages 9 1 Lifespan 9 1 1 Cause of degradation 9 2 Color balance 9 3 Efficiency of blue OLEDs 9 4 Water damage 9 5 Outdoor performance 9 6 Power consumption 9 7 Screen flicker 10 Manufacturers and commercial uses 10 1 Fashion 10 2 Automotive 10 3 Company specific applications 10 3 1 Samsung 10 3 2 Sony 10 3 3 LG 10 3 4 Mitsubishi 10 3 5 Recom Group 10 3 6 Dell 10 3 7 Apple 10 3 8 Nintendo 11 Research 12 See also 13 Notes 14 References 15 Further reading 16 External linksHistory editAndre Bernanose and co workers at the Nancy Universite in France made the first observations of electroluminescence in organic materials in the early 1950s They applied high alternating voltages in air to materials such as acridine orange dye either deposited on or dissolved in cellulose or cellophane thin films The proposed mechanism was either direct excitation of the dye molecules or excitation of electrons 10 11 12 13 In 1960 Martin Pope and some of his co workers at New York University in the United States developed ohmic dark injecting electrode contacts to organic crystals 14 15 16 They further described the necessary energetic requirements work functions for hole and electron injecting electrode contacts These contacts are the basis of charge injection in all modern OLED devices Pope s group also first observed direct current DC electroluminescence under vacuum on a single pure crystal of anthracene and on anthracene crystals doped with tetracene in 1963 17 using a small area silver electrode at 400 volts The proposed mechanism was field accelerated electron excitation of molecular fluorescence Pope s group reported in 1965 18 that in the absence of an external electric field the electroluminescence in anthracene crystals is caused by the recombination of a thermalized electron and hole and that the conducting level of anthracene is higher in energy than the exciton energy level Also in 1965 Wolfgang Helfrich and W G Schneider of the National Research Council in Canada produced double injection recombination electroluminescence for the first time in an anthracene single crystal using hole and electron injecting electrodes 19 the forerunner of modern double injection devices In the same year Dow Chemical researchers patented a method of preparing electroluminescent cells using high voltage 500 1500 V AC driven 100 3000 Hz electrically insulated one millimetre thin layers of a melted phosphor consisting of ground anthracene powder tetracene and graphite powder 20 Their proposed mechanism involved electronic excitation at the contacts between the graphite particles and the anthracene molecules The first Polymer LED PLED to be created was by Roger Partridge at the National Physical Laboratory in the United Kingdom It used a film of poly N vinylcarbazole up to 2 2 micrometers thick located between two charge injecting electrodes The light generated was readily visible in normal lighting conditions though the polymer used had 2 limitations low conductivity and the difficulty of injecting electrons 21 Later development of conjugated polymers would allow others to largely eliminate these problems His contribution has often been overlooked due to the secrecy NPL imposed on the project When it was patented in 1974 22 it was given a deliberately obscure catch all name while the government s Department for Industry tried and failed to find industrial collaborators to fund further development 23 As a result publication was delayed until 1983 24 25 26 27 Practical OLEDs edit Chemists Ching Wan Tang and Steven Van Slyke at Eastman Kodak built the first practical OLED device in 1987 28 This device used a two layer structure with separate hole transporting and electron transporting layers such that recombination and light emission occurred in the middle of the organic layer this resulted in a reduction in operating voltage and improvements in efficiency Research into polymer electroluminescence culminated in 1990 with J H Burroughesat the Cavendish Laboratory at Cambridge University UK reporting a high efficiency green light emitting polymer based device using 100 nm thick films of poly p phenylene vinylene 29 Moving from molecular to macromolecular materials solved the problems previously encountered with the long term stability of the organic films and enabled high quality films to be easily made 29 Subsequent research developed multilayer polymers and the new field of plastic electronics and OLED research and device production grew rapidly 30 White OLEDs pioneered by J Kidoet al at Yamagata University Japan in 1995 achieved the commercialization of OLED backlit displays and lighting 31 32 In 1999 Kodak and Sanyo had entered into a partnership to jointly research develop and produce OLED displays They announced the world s first 2 4 inch active matrix full color OLED display in September the same year 33 In September 2002 they presented a prototype of 15 inch HDTV format display based on white OLEDs with color filters at the CEATEC Japan 34 Manufacturing of small molecule OLEDs was started in 1997 by Pioneer Corporation followed by TDK in 2001 and Samsung NEC Mobile Display SNMD which later became one of the world s largest OLED display manufacturers Samsung Display in 2002 35 The Sony XEL 1 released in 2007 was the first OLED television 36 Universal Display Corporation one of the OLED materials companies holds a number of patents concerning the commercialization of OLEDs that are used by major OLED manufacturers around the world 37 38 On 5 December 2017 JOLED the successor of Sony and Panasonic s printable OLED business units began the world s first commercial shipment of inkjet printed OLED panels 39 40 Working principle edit nbsp Schematic of a bilayer OLED 1 Cathode 2 Emissive Layer 3 Emission of radiation 4 Conductive layer 5 Anode A typical OLED is composed of a layer of organic materials situated between two electrodes the anode and cathode all deposited on a substrate The organic molecules are electrically conductive as a result of delocalization of pi electrons caused by conjugation over part or all of the molecule These materials have conductivity levels ranging from insulators to conductors and are therefore considered organic semiconductors The highest occupied and lowest unoccupied molecular orbitals HOMO and LUMO of organic semiconductors are analogous to the valence and conduction bands of inorganic semiconductors 41 Originally the most basic polymer OLEDs consisted of a single organic layer One example was the first light emitting device synthesised by J H Burroughes et al which involved a single layer of poly p phenylene vinylene However multilayer OLEDs can be fabricated with two or more layers in order to improve device efficiency As well as conductive properties different materials may be chosen to aid charge injection at electrodes by providing a more gradual electronic profile 42 or block a charge from reaching the opposite electrode and being wasted 43 Many modern OLEDs incorporate a simple bilayer structure consisting of a conductive layer and an emissive layer Developments in OLED architecture in 2011 improved quantum efficiency up to 19 by using a graded heterojunction 44 In the graded heterojunction architecture the composition of hole and electron transport materials varies continuously within the emissive layer with a dopant emitter The graded heterojunction architecture combines the benefits of both conventional architectures by improving charge injection while simultaneously balancing charge transport within the emissive region 45 During operation a voltage is applied across the OLED such that the anode is positive with respect to the cathode Anodes are picked based upon the quality of their optical transparency electrical conductivity and chemical stability 46 A current of electrons flows through the device from cathode to anode as electrons are injected into the LUMO of the organic layer at the cathode and withdrawn from the HOMO at the anode This latter process may also be described as the injection of electron holes into the HOMO Electrostatic forces bring the electrons and the holes towards each other and they recombine forming an exciton a bound state of the electron and hole This happens closer to the electron transport layer part of the emissive layer because in organic semiconductors holes are generally more mobile than electrons The decay of this excited state results in a relaxation of the energy levels of the electron accompanied by emission of radiation whose frequency is in the visible region The frequency of this radiation depends on the band gap of the material in this case the difference in energy between the HOMO and LUMO As electrons and holes are fermions with half integer spin an exciton may either be in a singlet state or a triplet state depending on how the spins of the electron and hole have been combined Statistically three triplet excitons will be formed for each singlet exciton Decay from triplet states phosphorescence is spin forbidden increasing the timescale of the transition and limiting the internal efficiency of fluorescent devices Phosphorescent organic light emitting diodes make use of spin orbit interactions to facilitate intersystem crossing between singlet and triplet states thus obtaining emission from both singlet and triplet states and improving the internal efficiency Indium tin oxide ITO is commonly used as the anode material It is transparent to visible light and has a high work function which promotes injection of holes into the HOMO level of the organic layer A second conductive injection layer is typically added which may consist of PEDOT PSS 47 as the HOMO level of this material generally lies between the work function of ITO and the HOMO of other commonly used polymers reducing the energy barriers for hole injection Metals such as barium and calcium are often used for the cathode as they have low work functions which promote injection of electrons into the LUMO of the organic layer 48 Such metals are reactive so they require a capping layer of aluminium to avoid degradation Two secondary benefits of the aluminum capping layer include robustness to electrical contacts and the back reflection of emitted light out to the transparent ITO layer Experimental research has proven that the properties of the anode specifically the anode hole transport layer HTL interface topography plays a major role in the efficiency performance and lifetime of organic light emitting diodes Imperfections in the surface of the anode decrease anode organic film interface adhesion increase electrical resistance and allow for more frequent formation of non emissive dark spots in the OLED material adversely affecting lifetime Mechanisms to decrease anode roughness for ITO glass substrates include the use of thin films and self assembled monolayers Also alternative substrates and anode materials are being considered to increase OLED performance and lifetime Possible examples include single crystal sapphire substrates treated with gold Au film anodes yielding lower work functions operating voltages electrical resistance values and increasing lifetime of OLEDs 49 Single carrier devices are typically used to study the kinetics and charge transport mechanisms of an organic material and can be useful when trying to study energy transfer processes As current through the device is composed of only one type of charge carrier either electrons or holes recombination does not occur and no light is emitted For example electron only devices can be obtained by replacing ITO with a lower work function metal which increases the energy barrier of hole injection Similarly hole only devices can be made by using a cathode made solely of aluminium resulting in an energy barrier too large for efficient electron injection 50 51 52 Carrier balance editBalanced charge injection and transfer are required to get high internal efficiency pure emission of luminance layer without contaminated emission from charge transporting layers and high stability A common way to balance charge is optimizing the thickness of the charge transporting layers but is hard to control Another way is using the exciplex Exciplex formed between hole transporting p type and electron transporting n type side chains to localize electron hole pairs Energy is then transferred to luminophore and provide high efficiency An example of using exciplex is grafting Oxadiazole and carbazole side units in red diketopyrrolopyrrole doped Copolymer main chain shows improved external quantum efficiency and color purity in no optimized OLED 53 Material technologies editSmall molecules edit nbsp Alq3 28 commonly used in small molecule OLEDsOrganic small molecule electroluminescent materials have the advantages of a wide variety easy to purify and strong chemical modifications In order to make the luminescent materials to emit light as required some chromophores or unsaturated groups such as alkene bonds and benzene rings will usually be introduced in the molecular structure design to change the size of the conjugation range of the material so that the photophysical properties of the material changes In general the larger the range of p electron conjugation system the longer the wavelength of light emitted by the material For instance with the increase of the number of benzene rings the fluorescence emission peak of benzene naphthalene anthracene 54 and butyl gradually red shifted from 283 nm to 480 nm Common organic small molecule electroluminescent materials include aluminum complexes anthracenes biphenyl acetylene aryl derivatives coumarin derivatives 55 and various fluorochromes Efficient OLEDs using small molecules were first developed by Ching W Tang et al 56 at Eastman Kodak The term OLED traditionally refers specifically to this type of device though the term SM OLED is also in use 41 Molecules commonly used in OLEDs include organometallic chelates for example Alq3 used in the organic light emitting device reported by Tang et al fluorescent and phosphorescent dyes and conjugated dendrimers A number of materials are used for their charge transport properties for example triphenylamine and derivatives are commonly used as materials for hole transport layers 57 Fluorescent dyes can be chosen to obtain light emission at different wavelengths and compounds such as perylene rubrene and quinacridone derivatives are often used 58 Alq3 has been used as a green emitter electron transport material and as a host for yellow and red emitting dyes Because of the structural flexibility of small molecule electroluminescent materials thin films can be prepared by vacuum vapor deposition which is more expensive and of limited use for large area devices The vacuum coating system however can make the entire process from film growth to OLED device preparation in a controlled and complete operating environment helping to obtain uniform and stable films thus ensuring the final fabrication of high performance OLED devices However small molecule organic dyes are prone to fluorescence quenching 59 in the solid state resulting in lower luminescence efficiency The doped OLED devices are also prone to crystallization which reduces the luminescence and efficiency of the devices Therefore the development of devices based on small molecule electroluminescent materials is limited by high manufacturing costs poor stability short life and other shortcomings Coherent emission from a laser dye doped tandem SM OLED device excited in the pulsed regime has been demonstrated 60 The emission is nearly diffraction limited with a spectral width similar to that of broadband dye lasers 61 Researchers report luminescence from a single polymer molecule representing the smallest possible organic light emitting diode OLED device 62 Scientists will be able to optimize substances to produce more powerful light emissions Finally this work is a first step towards making molecule sized components that combine electronic and optical properties Similar components could form the basis of a molecular computer 63 Polymer light emitting diodes edit nbsp poly p phenylene vinylene used in the first PLED 29 Polymer light emitting diodes PLED P OLED also light emitting polymers LEP involve an electroluminescent conductive polymer that emits light when connected to an external voltage They are used as a thin film for full spectrum colour displays Polymer OLEDs are quite efficient and require a relatively small amount of power for the amount of light produced Vacuum deposition is not a suitable method for forming thin films of polymers If the polymeric OLED films are made by vacuum vapor deposition the chain elements will be cut off and the original photophysical properties will be compromised However polymers can be processed in solution and spin coating is a common method of depositing thin polymer films This method is more suited to forming large area films than thermal evaporation No vacuum is required and the emissive materials can also be applied on the substrate by a technique derived from commercial inkjet printing 64 65 However as the application of subsequent layers tends to dissolve those already present formation of multilayer structures is difficult with these methods The metal cathode may still need to be deposited by thermal evaporation in vacuum An alternative method to vacuum deposition is to deposit a Langmuir Blodgett film Typical polymers used in PLED displays include derivatives of poly p phenylene vinylene and polyfluorene Substitution of side chains onto the polymer backbone may determine the colour of emitted light 66 or the stability and solubility of the polymer for performance and ease of processing 67 While unsubstituted poly p phenylene vinylene PPV is typically insoluble a number of PPVs and related poly naphthalene vinylene s PNVs that are soluble in organic solvents or water have been prepared via ring opening metathesis polymerization 68 69 70 These water soluble polymers or conjugated poly electrolytes CPEs also can be used as hole injection layers alone or in combination with nanoparticles like graphene 71 Phosphorescent materials edit nbsp Ir mppy 3 a phosphorescent dopant which emits green light 72 Main article Phosphorescent organic light emitting diode Phosphorescent organic light emitting diodes use the principle of electrophosphorescence to convert electrical energy in an OLED into light in a highly efficient manner 73 74 with the internal quantum efficiencies of such devices approaching 100 75 Typically a polymer such as poly N vinylcarbazole is used as a host material to which an organometallic complex is added as a dopant Iridium complexes 74 such as Ir mppy 3 72 as of 2004 were a focus of research although complexes based on other heavy metals such as platinum 73 have also been used The heavy metal atom at the centre of these complexes exhibits strong spin orbit coupling facilitating intersystem crossing between singlet and triplet states By using these phosphorescent materials both singlet and triplet excitons will be able to decay radiatively hence improving the internal quantum efficiency of the device compared to a standard OLED where only the singlet states will contribute to emission of light Applications of OLEDs in solid state lighting require the achievement of high brightness with good CIE coordinates for white emission The use of macromolecular species like polyhedral oligomeric silsesquioxanes POSS in conjunction with the use of phosphorescent species such as Ir for printed OLEDs have exhibited brightnesses as high as 10 000 cd m2 76 Device architectures editStructure edit Bottom emission edit nbsp a Bottom emitting and b top emitting OLED structures c d Schematic diagrams based on bottom emitting and top emitting OLEDs with low and high contrast ratio respectively The bottom emission organic light emitting diode BE OLED is the architecture that was used in the early stage AMOLED displays It had a transparent anode fabricated on a glass substrate and a shiny reflective cathode Light is emitted from the transparent anode direction To reflect all the light towards the anode direction a relatively thick metal cathode such as aluminum is used For the anode high transparency indium tin oxide ITO was a typical choice to emit as much light as possible 77 Organic thin films including the emissive layer that actually generates the light are then sandwiched between the ITO anode and the reflective metal cathode The downside of bottom emission structure is that the light has to travel through the pixel drive circuits such as the thin film transistor TFT substrate and the area from which light can be extracted is limited and the light emission efficiency is reduced Top emission edit An alternative configuration is to switch the mode of emission A reflective anode and a transparent or more often semi transparent cathode are used so that the light emits from the cathode side and this configuration is called top emission OLED TE OLED Unlike BEOLEDs where the anode is made of transparent conductive ITO this time the cathode needs to be transparent and the ITO material is not an ideal choice for the cathode because of a damage issue due to the sputtering process 78 Thus a thin metal film such as pure Ag and the Mg Ag alloy are used for the semi transparent cathode due to their high transmittance and high conductivity 79 In contrast to the bottom emission light is extracted from the opposite side in top emission without the need of passing through multiple drive circuit layers Thus the light generated can be extracted more efficiently Improvements edit Micro cavity theory edit nbsp Sony s Super Top Emission OLED technology enhances the color purity of emitted lights When light waves meet while traveling along the same medium wave interference occurs This interference can be constructive or destructive It is sometimes desirable for several waves of the same frequency to sum up into a wave with higher amplitudes Since both electrodes are reflective in TEOLED light reflections can happen within the diode and they cause more complex interferences than those in BEOLEDs In addition to the two beam interference there exists a multi resonance interference between two electrodes Because the structure of TEOLEDs is similar to that of the Fabry Perot resonator or laser resonator which contains two parallel mirrors comparable to the two reflective electrodes 80 this effect is especially strong in TEOLED This two beam interference and the Fabry Perot interferences are the main factors in determining the output spectral intensity of OLED This optical effect is called the micro cavity effect In the case of OLED that means the cavity in a TEOLED could be especially designed to enhance the light output intensity and color purity with a narrow band of wavelengths without consuming more power In TEOLEDs the microcavity effect commonly occurs and when and how to restrain or make use of this effect is indispensable for device design To match the conditions of constructive interference different layer thicknesses are applied according to the resonance wavelength of that specific color The thickness conditions are carefully designed and engineered according to the peak resonance emitting wavelengths of the blue 460 nm green 530 nm and red 610 nm color LEDs This technology greatly improves the light emission efficiency of OLEDs and are able to achieve a wider color gamut due to high color purity Color filters edit In white color filter method red green and blue emissions are obtained from the same white light LEDs using different color filters 81 With this method the OLED materials produce white light which is then filtered to obtain the desired RGB colors This method eliminated the need to deposit three different organic emissive materials so only one kind of OLED material is used to produce white light It also eliminated the uneven degradation rate of blue pixels vs red and green pixels Disadvantages of this method are low color purity and contrast Also the filters absorb most of the emitted light requiring the background white light to be relatively strong to compensate for the drop in brightness and thus the power consumption for such displays can be higher Color filters can also be implemented into bottom and top emission OLEDs By adding the corresponding RGB color filters after the semi transparent cathode even purer wavelengths of light can be obtained The use of a microcavity in top emission OLEDs with color filters also contributes to an increase in the contrast ratio by reducing the reflection of incident ambient light 82 In a conventional panel a circular polarizer was installed on the panel surface While this was provided to prevent the reflection of ambient light it also reduced the light output By replacing this polarizing layer with color filters the light intensity is not affected and essentially all ambient reflected light can be cut allowing a better contrast on the display panel This potentially reduced the need for brighter pixels and can lower the power consumption Other architectures edit Transparent OLEDs edit Transparent OLEDs use transparent or semi transparent contacts on both sides of the device to create displays that can be made to be both top and bottom emitting transparent TOLEDs can greatly improve contrast making it much easier to view displays in bright sunlight 83 This technology can be used in Head up displays smart windows or augmented reality applications Graded heterojunction edit Graded heterojunction OLEDs gradually decrease the ratio of electron holes to electron transporting chemicals 44 This results in almost double the quantum efficiency of existing OLEDs Stacked OLEDs edit Stacked OLEDs use a pixel architecture that stacks the red green and blue subpixels on top of one another instead of next to one another leading to substantial increase in gamut and color depth 84 and greatly reducing pixel gap Other display technologies with RGB and RGBW pixels mapped next to each other tend to decrease potential resolution Inverted OLED edit In contrast to a conventional OLED in which the anode is placed on the substrate an inverted OLED uses a bottom cathode that can be connected to the drain end of an n channel TFT especially for the low cost amorphous silicon TFT backplane useful in the manufacturing of AMOLED displays 85 All OLED displays passive and active matrix use a driver IC often mounted using the chip on glass COG technology with an anisotropic conductive film 86 Color patterning technologies editShadow mask patterning method edit The most commonly used patterning method for organic light emitting displays is shadow masking during film deposition 87 also called the RGB side by side method or RGB pixelation method Metal sheets with multiple apertures made of low thermal expansion material such as nickel alloy are placed between the heated evaporation source and substrate so that the organic or inorganic material from the evaporation source is masked off or blocked by the sheet from reaching the substrate in most locations so the materials are deposited only on the desired locations on the substrate and the rest is deposited and remains on the sheet Almost all small OLED displays for smartphones have been manufactured using this method Fine metal masks FMMs made by photochemical machining reminiscent of old CRT shadow masks are used in this process The dot density of the mask will determine the pixel density of the finished display 88 Fine Hybrid Masks FHMs are lighter than FFMs reducing bending caused by the mask s own weight and are made using an electroforming process 89 90 This method requires heating the electroluminescent materials at 300 C using a thermal method in a high vacuum of 10 5 Pa An oxygen meter ensures that no oxygen enters the chamber as it could damage through oxidation the electroluminescent material which is in powder form The mask is aligned with the mother substrate before every use and it is placed just below the substrate The substrate and mask assembly are placed at the top of the deposition chamber 91 Afterwards the electrode layer is deposited by subjecting silver and aluminum powder to 1000 C using an electron beam 92 Shadow masks allow for high pixel densities of up to 2 250 DPI 890 dot cm High pixel densities are necessary for virtual reality headsets 93 White color filter method edit Although the shadow mask patterning method is a mature technology used from the first OLED manufacturing it causes many issues like dark spot formation due to mask substrate contact or misalignment of the pattern due to the deformation of shadow mask Such defect formation can be regarded as trivial when the display size is small however it causes serious issues when a large display is manufactured which brings significant production yield loss To circumvent such issues white emission devices with 4 sub pixel color filters white red green and blue have been used for large televisions In spite of the light absorption by the color filter state of the art OLED televisions can reproduce color very well such as 100 NTSC and consume little power at the same time This is done by using an emission spectrum with high human eye sensitivity special color filters with a low spectrum overlap and performance tuning with color statistics into consideration 94 This approach is also called the Color by white method Other color patterning approaches edit There are other types of emerging patterning technologies to increase the manufacturability of OLEDs Patternable organic light emitting devices use a light or heat activated electroactive layer A latent material PEDOT TMA is included in this layer that upon activation becomes highly efficient as a hole injection layer Using this process light emitting devices with arbitrary patterns can be prepared 95 Colour patterning can be accomplished by means of a laser such as a radiation induced sublimation transfer RIST 96 Organic vapour jet printing OVJP uses an inert carrier gas such as argon or nitrogen to transport evaporated organic molecules as in organic vapour phase deposition The gas is expelled through a micrometre sized nozzle or nozzle array close to the substrate as it is being translated This allows printing arbitrary multilayer patterns without the use of solvents Like ink jet material deposition inkjet etching IJE deposits precise amounts of solvent onto a substrate designed to selectively dissolve the substrate material and induce a structure or pattern Inkjet etching of polymer layers in OLED s can be used to increase the overall out coupling efficiency In OLEDs light produced from the emissive layers of the OLED is partially transmitted out of the device and partially trapped inside the device by total internal reflection TIR This trapped light is wave guided along the interior of the device until it reaches an edge where it is dissipated by either absorption or emission Inkjet etching can be used to selectively alter the polymeric layers of OLED structures to decrease overall TIR and increase out coupling efficiency of the OLED Compared to a non etched polymer layer the structured polymer layer in the OLED structure from the IJE process helps to decrease the TIR of the OLED device IJE solvents are commonly organic instead of water based due to their non acidic nature and ability to effectively dissolve materials at temperatures under the boiling point of water 97 Transfer printing is an emerging technology to assemble large numbers of parallel OLED and AMOLED devices efficiently It takes advantage of standard metal deposition photolithography and etching to create alignment marks commonly on glass or other device substrates Thin polymer adhesive layers are applied to enhance resistance to particles and surface defects Microscale ICs are transfer printed onto the adhesive surface and then baked to fully cure adhesive layers An additional photosensitive polymer layer is applied to the substrate to account for the topography caused by the printed ICs reintroducing a flat surface Photolithography and etching removes some polymer layers to uncover conductive pads on the ICs Afterwards the anode layer is applied to the device backplane to form the bottom electrode OLED layers are applied to the anode layer with conventional vapor deposition and covered with a conductive metal electrode layer As of 2011 update transfer printing was capable to print onto target substrates up to 500 mm 400 mm This size limit needs to expand for transfer printing to become a common process for the fabrication of large OLED AMOLED displays 98 Experimental OLED displays using conventional photolithography techniques instead of FMMs have been demonstrated allowing for large substrate sizes as it eliminates the need for a mask that needs to be as large as the substrate and good yield control 99 Thin film transistor backplanes editFor a high resolution display like a TV a thin film transistor TFT backplane is necessary to drive the pixels correctly As of 2019 low temperature polycrystalline silicon LTPS TFT is widely used for commercial AMOLED displays LTPS TFT has variation of the performance in a display so various compensation circuits have been reported 100 Due to the size limitation of the excimer laser used for LTPS the AMOLED size was limited To cope with the hurdle related to the panel size amorphous silicon microcrystalline silicon backplanes have been reported with large display prototype demonstrations 101 An indium gallium zinc oxide IGZO backplane can also be used Advantages editFurther information Comparison of CRT LCD plasma and OLED displays The different manufacturing process of OLEDs has several advantages over flat panel displays made with LCD technology Lower cost in the future OLEDs can be printed onto any suitable substrate by an inkjet printer or even by screen printing 102 theoretically making them cheaper to produce than LCD or plasma displays However fabrication of the OLED substrate as of 2018 is costlier than that for TFT LCDs 103 Roll to roll vapor deposition methods for organic devices do allow mass production of thousands of devices per minute for minimal cost however this technique also induces problems devices with multiple layers can be challenging to make because of registration lining up the different printed layers to the required degree of accuracy Lightweight and flexible plastic substrates OLED displays can be fabricated on flexible plastic substrates leading to the possible fabrication of flexible organic light emitting diodes for other new applications such as roll up displays embedded in fabrics or clothing If a substrate like polyethylene terephthalate PET 104 can be used the displays may be produced inexpensively Furthermore plastic substrates are shatter resistant unlike the glass displays used in LCD devices Better picture quality OLEDs enable a greater contrast ratio and wider viewing angle compared to LCDs because OLED pixels emit light directly This also provides a deeper black level since a black OLED display emits no light Furthermore OLED pixel colors appear correct and unshifted even as the viewing angle approaches 90 from the normal Better power efficiency LCDs filter the light emitted from a backlight allowing a small fraction of light through Thus they cannot show true black However an inactive OLED element does not produce light or consume power allowing true blacks 105 Removing the backlight also makes OLEDs lighter because some substrates are not needed Response time OLEDs also have a much faster response time than an LCD Using response time compensation technologies the fastest modern LCDs can reach response times as low as 1 ms for their fastest color transition and are capable of refresh frequencies as high as 240 Hz According to LG OLED response times are up to 1 000 times faster than LCD 106 putting conservative estimates at under 10 ms 0 01 ms which could theoretically accommodate refresh frequencies approaching 100 kHz 100 000 Hz Due to their extremely fast response time OLED displays can also be easily designed to be strobed creating an effect similar to CRT flicker in order to avoid the sample and hold behavior seen on both LCDs and some OLED displays which creates the perception of motion blur 107 Disadvantages edit nbsp Light emitting polymer LEP display showing partial failure nbsp An old OLED display showing wearLifespan edit The biggest technical problem for OLEDs is the limited lifetime of the organic materials One 2008 technical report on an OLED TV panel found that after 1 000 hours the blue luminance degraded by 12 the red by 7 and the green by 8 108 In particular blue OLEDs at that time had a lifetime of around 14 000 hours to half original brightness five years at eight hours per day when used for flat panel displays This is lower than the typical lifetime of LCD LED or PDP technology each rated for about 25 000 40 000 hours to half brightness depending on manufacturer and model One major challenge for OLED displays is the formation of dark spots due to the ingress of oxygen and moisture which degrades the organic material over time whether or not the display is powered 109 110 111 In 2016 LG Electronics reported an expected lifetime of 100 000 hours up from 36 000 hours in 2013 112 A US Department of Energy paper shows that the expected lifespans of OLED lighting products goes down with increasing brightness with an expected lifespan of 40 000 hours at 25 brightness or 10 000 hours at 100 brightness 113 114 Cause of degradation edit This subsection may be too technical for most readers to understand Please help improve it to make it understandable to non experts without removing the technical details April 2019 Learn how and when to remove this template message Degradation occurs because of the accumulation of nonradiative recombination centers and luminescence quenchers in the emissive zone It is said that the chemical breakdown in the semiconductors occurs in four steps recombination a of charge carriers through the absorption of UV light homolytic dissociation subsequent radical addition reactions that form p radicals disproportionation between two radicals resulting in hydrogen atom transfer reactions 115 However some manufacturers displays aim to increase the lifespan of OLED displays pushing their expected life past that of LCD displays by improving light outcoupling thus achieving the same brightness at a lower drive current 116 117 In 2007 experimental OLEDs were created which can sustain 400 cd m2 of luminance for over 198 000 hours for green OLEDs and 62 000 hours for blue OLEDs 118 In 2012 OLED lifetime to half of the initial brightness was improved to 900 000 hours for red 1 450 000 hours for yellow and 400 000 hours for green at an initial luminance of 1 000 cd m2 119 Proper encapsulation is critical for prolonging an OLED display s lifetime as the OLED light emitting electroluminescent materials are sensitive to oxygen and moisture When exposed to moisture or oxygen the electroluminescent materials in OLEDs degrade as they oxidize generating black spots and reducing or shrinking the area that emits light reducing light output This reduction can occur in a pixel by pixel basis This can also lead to delamination of the electrode layer eventually leading to complete panel failure Degradation occurs three orders of magnitude faster when exposed to moisture than when exposed to oxygen Encapsulation can be performed by applying an epoxy adhesive with dessicant 120 by laminating a glass sheet with epoxy glue and dessicant 121 followed by vacuum degassing or by using Thin Film Encapsulation TFE which is a multi layer coating of alternating organic and inorganic layers The organic layers are applied using inkjet printing and the inorganic layers are applied using Atomic Layer Deposition ALD The encapsulation process is carried out under a nitrogen environment using UV curable LOCA glue and the electroluminescent and electrode material deposition processes are carried out under a high vacuum The encapsulation and material deposition processes are carried out by a single machine after the Thin film transistors have been applied The transistors are applied in a process that is the same for LCDs The electroluminescent materials can also be applied using inkjet printing 122 123 124 92 125 120 126 Color balance edit The OLED material used to produce blue light degrades much more rapidly than the materials used to produce other colors in other words blue light output will decrease relative to the other colors of light This variation in the differential color output will change the color balance of the display and is much more noticeable than a uniform decrease in overall luminance 127 This can be avoided partially by adjusting the color balance but this may require advanced control circuits and input from a knowledgeable user More commonly though manufacturers optimize the size of the R G and B subpixels to reduce the current density through the subpixel in order to equalize lifetime at full luminance For example a blue subpixel may be 75 larger than the green subpixel The red subpixel may be 10 larger than the green Efficiency of blue OLEDs edit This subsection may be too technical for most readers to understand Please help improve it to make it understandable to non experts without removing the technical details April 2019 Learn how and when to remove this template message Improvements to the efficiency and lifetime of blue OLEDs is vital to the success of OLEDs as replacements for LCD technology Considerable research has been invested in developing blue OLEDs with high external quantum efficiency as well as a deeper blue color 128 129 130 Since 2012 research focuses on organic materials exhibiting thermally activated delayed fluorescence TADF discovered at Kyushu University OPERA and UC Santa Barbara CPOS TADF would allow stable and high efficiency solution processable meaning that the organic materials are layered in solutions producing thinner layers blue emitters with internal quantum efficiencies reaching 100 131 Early in 2017 55 TADF materials based on oxygen based fully bridged boron type electron accepttors had achieved huge breakthrough in their proprities The external quantum efficiency of TADF OLED for blue and green light had achieved 38 with thin full width half maximum and high color purity In 2022 Han et al 132 synthesized a new D A type luminescent material TDBA Cz and used the m AC DBNA synthesized by Meng et al as a control to investigate the effect of the substitution site of the carbazole unit as an electron donor on the oxygen bridged triphenylboron electron acceptor unit on the photophysical properties of the overall molecule It was found that the introduction of two carbazole units into the same benzene ring of the oxygen bridged triphenylboron electron acceptor unit could effectively suppress the conformational relaxation of the molecule during the radiative transition resulting in narrow bandwidth blue light emission In addition TDBA Cz is the first reported blue material to achieve both a FWHM down to 45 nm and a maximum EQE of 21 4 in a non doped TADF OLED Blue TADF emitters are expected to market by 2020 133 134 and would be used for WOLED displays with phosphorescent color filters as well as blue OLED displays with ink printed QD color filters Water damage edit Water can instantly damage the organic materials of the displays Therefore improved sealing processes are important for practical manufacturing Water damage especially may limit the longevity of more flexible displays 135 Outdoor performance edit As an emissive display technology OLEDs rely completely upon converting electricity to light unlike most LCDs which are to some extent reflective E paper leads the way in efficiency with 33 ambient light reflectivity enabling the display to be used without any internal light source The metallic cathode in an OLED acts as a mirror with reflectance approaching 80 leading to poor readability in bright ambient light such as outdoors However with the proper application of a circular polarizer and antireflective coatings the diffuse reflectance can be reduced to less than 0 1 With 10 000 fc incident illumination typical test condition for simulating outdoor illumination that yields an approximate photopic contrast of 5 1 Advances in OLED technologies however enable OLEDs to become actually better than LCDs in bright sunlight The AMOLED display in the Galaxy S5 for example was found to outperform all LCD displays on the market in terms of power usage brightness and reflectance 136 Power consumption edit While an OLED will consume around 40 of the power of an LCD displaying an image that is primarily black for the majority of images it will consume 60 80 of the power of an LCD However an OLED can use more than 300 power to display an image with a white background such as a document or web site 137 This can lead to reduced battery life in mobile devices when white backgrounds are used Screen flicker edit Many OLEDs use pulse width modulation to display colour brightness gradations For example a pixel instructed to display gray will flicker on and off rapidly creating a subtle strobe effect 138 The alternative way to decrease brightness would be to decrease power to the display which would eliminate screen flicker to the detriment of colour balance which deteriorates as brightness decreases However use of PWM gradations may be more harmful for eye health 139 Manufacturers and commercial uses edit nbsp Magnified image of the AMOLED screen on the Google Nexus One smartphone using the RGBG system of the PenTile Matrix Family nbsp A 3 8 cm 1 5 in OLED display from a Creative ZEN V media player nbsp OLED lighting in a shopping mall in Aachen GermanyAlmost all OLED manufacturers rely on material deposition equipment that is only made by a handful of companies 140 the most notable one being Canon Tokki a unit of Canon Inc Canon Tokki is reported to have a near monopoly of the giant OLED manufacturing vacuum machines notable for their 100 metre 330 ft size 141 Apple has relied solely on Canon Tokki in its bid to introduce its own OLED displays for the iPhones released in 2017 142 The electroluminescent materials needed for OLEDs are also made by a handful of companies some of them being Merck Universal Display Corporation and LG Chem 143 The machines that apply these materials can operate continuously for 5 6 days and can process a mother substrate in 5 minutes 144 OLED technology is used in commercial applications such as displays for mobile phones and portable digital media players car radios and digital cameras among others as well as lighting 145 Such portable display applications favor the high light output of OLEDs for readability in sunlight and their low power drain Portable displays are also used intermittently so the lower lifespan of organic displays is less of an issue Prototypes have been made of flexible and rollable displays which use OLEDs unique characteristics Applications in flexible signs and lighting are also being developed 146 OLED lighting offers several advantages over LED lighting such as higher quality illumination more diffuse light source and panel shapes 145 Philips Lighting has made OLED lighting samples under the brand name Lumiblade available online 147 and Novaled AG based in Dresden Germany introduced a line of OLED desk lamps called Victory in September 2011 148 Nokia introduced OLED mobile phones including the N85 and the N86 8MP both of which feature an AMOLED display OLEDs have also been used in most Motorola and Samsung color cell phones as well as some HTC LG and Sony Ericsson models 149 OLED technology can also be found in digital media players such as the Creative ZEN V the iriver clix the Zune HD and the Sony Walkman X Series The Google and HTC Nexus One smartphone includes an AMOLED screen as does HTC s own Desire and Legend phones However due to supply shortages of the Samsung produced displays certain HTC models will use Sony s SLCD displays in the future 150 while the Google and Samsung Nexus S smartphone will use Super Clear LCD instead in some countries 151 OLED displays were used in watches made by Fossil JR 9465 and Diesel DZ 7086 Other manufacturers of OLED panels include Anwell Technologies Limited Hong Kong 152 AU Optronics Taiwan 153 Chimei Innolux Corporation Taiwan 154 LG Korea 155 and others 156 DuPont stated in a press release in May 2010 that they can produce a 50 inch OLED TV in two minutes with a new printing technology If this can be scaled up in terms of manufacturing then the total cost of OLED TVs would be greatly reduced DuPont also states that OLED TVs made with this less expensive technology can last up to 15 years if left on for a normal eight hour day 157 158 The use of OLEDs may be subject to patents held by Universal Display Corporation Eastman Kodak DuPont General Electric Royal Philips Electronics numerous universities and others 159 By 2008 thousands of patents associated with OLEDs came from larger corporations and smaller technology companies 41 Flexible OLED displays have been used by manufacturers to create curved displays such as the Galaxy S7 Edge but they were not in devices that can be flexed by the users 160 Samsung demonstrated a roll out display in 2016 161 nbsp nbsp Samsung foldable smartphones On 31 October 2018 Royole a Chinese electronics company unveiled the world s first foldable screen phone featuring a flexible OLED display 162 On 20 February 2019 Samsung announced the Samsung Galaxy Fold with a foldable OLED display from Samsung Display its majority owned subsidiary 163 At MWC 2019 on 25 February 2019 Huawei announced the Huawei Mate X featuring a foldable OLED display from BOE 164 165 The 2010s also saw the wide adoption of tracking gate line in pixel TGP which moves the driving circuitry from the borders of the display to in between the display s pixels allowing for narrow bezels 166 In 2023 the German startup Inuru has announced to manufacture low cost OLED with printing for packaging and fashion applications 167 Fashion edit Textiles incorporating OLEDs are an innovation in the fashion world and pose for a way to integrate lighting to bring inert objects to a whole new level of fashion The hope is to combine the comfort and low cost properties of textile with the OLEDs properties of illumination and low energy consumption Although this scenario of illuminated clothing is highly plausible challenges are still a road block Some issues include the lifetime of the OLED rigidness of flexible foil substrates and the lack of research in making more fabric like photonic textiles 168 Automotive edit The number of automakers using OLEDs is still rare and limited to the high end of the market For example the 2010 Lexus RX features an OLED display instead of a thin film transistor TFT LCD display A Japanese manufacturer Pioneer Electronic Corporation produced the first car stereos with a monochrome OLED display which was also the world s first OLED product 169 The Aston Martin DB9 incorporated the world s first automotive OLED display 170 which was manufactured by Yazaki 171 followed by the 2004 Jeep Grand Cherokee and the Chevrolet Corvette C6 172 The 2015 Hyundai Sonata and Kia Soul EV use a 3 5 inch white PMOLED display Company specific applications edit Samsung edit nbsp Samsung AMOLED displaysBy 2004 Samsung Display a subsidiary of South Korea s largest conglomerate and a former Samsung NEC joint venture was the world s largest OLED manufacturer producing 40 of the OLED displays made in the world 173 and as of 2010 has a 98 share of the global AMOLED market 174 The company is leading the world of OLED industry generating 100 2 million out of the total 475 million revenues in the global OLED market in 2006 175 As of 2006 it held more than 600 American patents and more than 2800 international patents making it the largest owner of AMOLED technology patents 175 Samsung SDI announced in 2005 the world s largest OLED TV at the time at 21 inches 53 cm 176 This OLED featured the highest resolution at the time of 6 22 million pixels In addition the company adopted active matrix based technology for its low power consumption and high resolution qualities This was exceeded in January 2008 when Samsung showcased the world s largest and thinnest OLED TV at the time at 31 inches 78 cm and 4 3 mm 177 In May 2008 Samsung unveiled an ultra thin 12 1 inch 30 cm laptop OLED display concept with a 1 280 768 resolution with infinite contrast ratio 178 According to Woo Jong Lee Vice President of the Mobile Display Marketing Team at Samsung SDI the company expected OLED displays to be used in notebook PCs as soon as 2010 179 In October 2008 Samsung showcased the world s thinnest OLED display also the first to be flappable and bendable 180 It measures just 0 05 mm thinner than paper yet a Samsung staff member said that it is technically possible to make the panel thinner 180 To achieve this thickness Samsung etched an OLED panel that uses a normal glass substrate The drive circuit was formed by low temperature polysilicon TFTs Also low molecular organic EL materials were employed The pixel count of the display is 480 272 The contrast ratio is 100 000 1 and the luminance is 200 cd m2 The colour reproduction range is 100 of the NTSC standard As of 2020 the world s largest OLED television is an 88 inch with an 8K resolution frame rate up to 120 fps and cost of 34 676 US Dollars 181 At the Consumer Electronics Show CES in January 2010 Samsung demonstrated a laptop computer with a large transparent OLED display featuring up to 40 transparency 182 and an animated OLED display in a photo ID card 183 Samsung s 2010 AMOLED smartphones used their Super AMOLED trademark with the Samsung Wave S8500 and Samsung i9000 Galaxy S being launched in June 2010 In January 2011 Samsung announced their Super AMOLED Plus displays which offer several advances over the older Super AMOLED displays real stripe matrix 50 more sub pixels thinner form factor brighter image and an 18 reduction in energy consumption 184 At CES 2012 Samsung introduced the first 55 TV screen that uses Super OLED technology 185 On 8 January 2013 at CES Samsung unveiled a unique curved 4K Ultra S9 OLED television which they state provides an IMAX like experience for viewers 186 On 13 August 2013 Samsung announced availability of a 55 inch curved OLED TV model KN55S9C in the US at a price point of 8999 99 187 On 6 September 2013 Samsung launched its 55 inch curved OLED TV model KE55S9C in the United Kingdom with John Lewis 188 Samsung introduced the Galaxy Round smartphone in the Korean market in October 2013 The device features a 1080p screen measuring 5 7 inches 14 cm that curves on the vertical axis in a rounded case The corporation has promoted the following advantages A new feature called Round Interaction that allows users to look at information by tilting the handset on a flat surface with the screen off and the feel of one continuous transition when the user switches between home screens 189 Samsung released a new line of OLED TVs in 2022 its first using the technology since 2013 190 They use panels sourced from Samsung Display previously LG was the sole manufacturer of OLED panels for TVs 191 Sony edit nbsp Sony XEL 1 the world s first OLED TV 36 front The Sony CLIE PEG VZ90 was released in 2004 being the first PDA to feature an OLED screen 192 Other Sony products to feature OLED screens include the MZ RH1 portable minidisc recorder released in 2006 193 and the Walkman X Series 194 At the 2007 Las Vegas Consumer Electronics Show CES Sony showcased a 11 inch 28 cm resolution 960 540 and 27 inch 69 cm full HD resolution at 1920 1080 OLED TV models 195 Both claimed 1 000 000 1 contrast ratios and total thicknesses including bezels of 5 mm In April 2007 Sony announced it would manufacture 1000 11 inch 28 cm OLED TVs per month for market testing purposes 196 On 1 October 2007 Sony announced that the 11 inch 28 cm model XEL 1 was the first commercial OLED TV 36 and it was released in Japan in December 2007 197 In May 2007 Sony publicly unveiled a video of a 2 5 inch 6 4 cm flexible OLED screen which is only 0 3 millimeters thick 198 At the Display 2008 exhibition Sony demonstrated a 0 2 mm thick 3 5 inches 8 9 cm display with a resolution of 320 200 pixels and a 0 3 mm thick 11 inch 28 cm display with 960 540 pixels resolution one tenth the thickness of the XEL 1 199 200 In July 2008 a Japanese government body said it would fund a joint project of leading firms which is to develop a key technology to produce large energy saving organic displays The project involves one laboratory and 10 companies including Sony Corp NEDO said the project was aimed at developing a core technology to mass produce 40 inch or larger OLED displays in the late 2010s 201 In October 2008 Sony published results of research it carried out with the Max Planck Institute over the possibility of mass market bending displays which could replace rigid LCDs and plasma screens Eventually bendable see through displays could be stacked to produce 3D images with much greater contrast ratios and viewing angles than existing products 202 Sony exhibited a 24 5 62 cm prototype OLED 3D television during the Consumer Electronics Show in January 2010 203 In January 2011 Sony announced the PlayStation Vita handheld game console the successor to the PSP will feature a 5 inch OLED screen 204 On 17 February 2011 Sony announced its 25 63 5 cm OLED Professional Reference Monitor aimed at the Cinema and high end Drama Post Production market 205 On 25 June 2012 Sony and Panasonic announced a joint venture for creating low cost mass production OLED televisions by 2013 206 Sony unveiled its first OLED TV since 2008 at CES 2017 called A1E It revealed two other models in 2018 one at CES 2018 called A8F and other a Master Series TV called A9F At CES 2019 they unveiled another two models one the A8G and the other another Bravia Series TV called A9G Then at CES 2020 they revealed the A8H which was effectively an A9G in terms of picture quality but with some compromises due to its lower cost At the same event they also revealed a 48 inch version of the A9G making this its smallest OLED TV since the XEL 1 207 208 209 210 LG edit On 9 April 2009 LG acquired Kodak s OLED business and started to utilize white OLED technology 211 212 As of 2010 LG Electronics produced one model of OLED television the 15 inch 38 cm 15EL9500 213 and had announced a 31 inch 79 cm OLED 3D television for March 2011 214 On 26 December 2011 LG officially announced the world s largest 55 inch 140 cm OLED panel and featured it at CES 2012 215 In late 2012 LG announces the launch of the 55EM9600 OLED television in Australia 216 In January 2015 LG Display signed a long term agreement with Universal Display Corporation for the supply of OLED materials and the right to use their patented OLED emitters 217 Mitsubishi edit Lumiotec is the first company in the world developing and selling since January 2011 mass produced OLED lighting panels with such brightness and long lifetime Lumiotec is a joint venture of Mitsubishi Heavy Industries ROHM Toppan Printing and Mitsui amp Co On 1 June 2011 Mitsubishi Electric installed a 6 meter OLED sphere in Tokyo s Science Museum 218 Recom Group edit On 6 January 2011 Los Angeles based technology company Recom Group introduced the first small screen consumer application of the OLED at the Consumer Electronics Show in Las Vegas This was a 2 8 7 cm OLED display being used as a wearable video name tag 219 At the Consumer Electronics Show in 2012 Recom Group introduced the world s first video mic flag incorporating three 2 8 7 cm OLED displays on a standard broadcaster s mic flag The video mic flag allowed video content and advertising to be shown on a broadcasters standard mic flag 220 Dell edit On 6 January 2016 Dell announced the Ultrasharp UP3017Q OLED monitor at the Consumer Electronics Show in Las Vegas 221 The monitor was announced to feature a 30 inch 76 cm 4K UHD OLED panel with a 120 Hz refresh rate 0 1 millisecond response time and a contrast ratio of 400 000 1 The monitor was set to sell at a price of 4 999 and release in March 2016 just a few months later As the end of March rolled around the monitor was not released to the market and Dell did not speak on reasons for the delay Reports suggested that Dell canceled the monitor as the company was unhappy with the image quality of the OLED panel especially the amount of color drift that it displayed when you viewed the monitor from the sides 222 On 13 April 2017 Dell finally released the UP3017Q OLED monitor to the market at a price of 3 499 1 500 less than its original spoken price of 4 999 at CES 2016 In addition to the price drop the monitor featured a 60 Hz refresh rate and a contrast ratio of 1 000 000 1 As of June 2017 the monitor is no longer available to purchase from Dell s website Apple edit Apple began using OLED panels in its watches in 2015 and in its laptops in 2016 with the introduction of an OLED touchbar to the MacBook Pro 223 In 2017 Apple announced the introduction of their tenth anniversary iPhone X with their own optimized OLED display licensed from Universal Display Corporation 224 With the exception of the iPhone SE line iPhone XR and iPhone 11 all iPhones released since then have also featured OLED displays Nintendo edit A third model of Nintendo s Switch a hybrid gaming system features an OLED panel in place of the original model s LCD panel Announced in the summer of 2021 it was released on 8 October 2021 225 Research editIn 2014 Mitsubishi Chemical Corporation MCC a subsidiary of Mitsubishi Chemical Holdings developed an OLED panel with a 30 000 hour life twice that of conventional OLED panels 226 The search for efficient OLED materials has been extensively supported by simulation methods it is possible to calculate important properties computationally independent of experimental input 227 228 making materials development cheaper On 18 October 2018 Samsung showed of their research roadmap at their 2018 Samsung OLED Forum This included Fingerprint on Display FoD Under Panel Sensor UPS Haptic on Display HoD and Sound on Display SoD 229 Various venders are also researching cameras under OLEDs Under Display Cameras According to IHS Markit Huawei has partnered with BOE Oppo with China Star Optoelectronics Technology CSOT Xiaomi with Visionox 230 In 2020 researchers at the Queensland University of Technology QUT proposed using human hair which is a source of carbon and nitrogen to create OLED displays 231 See also edit nbsp Electronics portalComparison of display technology Field emission display type of displayPages displaying wikidata descriptions as a fallback Flat panel display Electronic display technology Flexible electronics Mounting of electronic devices on flexible plastic substrates Flexible organic light emitting diode List of emerging technologies List of flat panel display manufacturers Molecular electronics Branch of chemistry and electronics Organic light emitting transistor form of transistor that emits lightPages displaying wikidata descriptions as a fallback Printed electronics Electronic devices created by various printing methods Quantum dot display Type of display device Roll to roll processing countinous printing method that prints directly onto a roll of fabric or other materialsPages displaying wikidata descriptions as a fallback Light on dark color scheme Type of color scheme Dark Mode Surface conduction electron emitter display CRT screen LED display microLED Mini LEDNotes edit The energy absorbed by a material is released in the form of photons Generally these photons contain the same or less energy than those initially absorbed This effect is how 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August 2019 Retrieved 16 August 2019 Discarded human hair repurposed to make new OLED screens New Atlas 5 June 2020 Further reading editT Tsujimura OLED Display Fundamentals and Applications Wiley SID Series in Display Technology New York 2017 ISBN 978 1 119 18731 8 P Chamorro Posada J Martin Gil P Martin Ramos L M Navas Gracia Fundamentos de la Tecnologia OLED Fundamentals of OLED Technology University of Valladolid Spain 2008 ISBN 978 84 936644 0 4 Available online with permission from the authors at the webpage Fundamentos de la Tecnologia OLED Kordt Pascal et al 2015 Modeling of Organic Light Emitting Diodes From Molecular to Device Properties Advanced Functional Materials 25 13 1955 1971 doi 10 1002 adfm 201403004 hdl 21 11116 0000 0001 6CD1 A S2CID 18575622 Shinar Joseph Ed Organic Light Emitting Devices A Survey NY Springer Verlag 2004 ISBN 0 387 95343 4 Hari Singh Nalwa Ed Handbook of Luminescence Display Materials and Devices Volume 1 3 American Scientific Publishers Los Angeles 2003 ISBN 1 58883 010 1 Volume 1 Organic Light Emitting Diodes Hari Singh Nalwa Ed Handbook of Organic Electronics and Photonics Volume 1 3 American Scientific Publishers Los Angeles 2008 ISBN 1 58883 095 0 Mullen Klaus Ed Organic Light Emitting Devices Synthesis Properties and Applications Wiley VCH 2006 ISBN 3 527 31218 8 Yersin Hartmut Ed Highly Efficient OLEDs with Phosphorescent Materials Wiley VCH 2007 ISBN 3 527 40594 1 Kho Mu Jeong Javed T Mark R Maier E and David C 2008 Final Report OLED Solid State Lighting Kodak European Research MOTI Management of Technology and Innovation Project Judge Business School of the University of Cambridge and Kodak European Research Final Report presented on 4 March 2008 at Kodak European Research at Cambridge Science Park Cambridge UK pages 1 12 Display New Vision 12 February 2018 Between cut throat competition Which is better OLED LCD or PMOLED External links edit nbsp Wikimedia Commons has media related to OLED OLED LCD amp TFT Construction and Difference advantages and disadvantages 08 Juli 2020 Structure and working principle of OLEDs and electroluminescent displays MIT introduction to OLED technology video Historical list of OLED products from 1996 to present Retrieved from https en wikipedia org w index php title OLED amp oldid 1200568821, wikipedia, wiki, book, books, library,

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