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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. 25 Originally, the most basic polymer oleds consisted of a single organic layer. One example was the first light-emitting device synthesised. Burroughes., 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.

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Tang and Steven Van Slyke at Eastman Kodak built the first practical oled device in 1987. 21 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. 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). 22 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.

23 Subsequent research developed multilayer polymers and the new field of plastic electronics and oled research and device production grew rapidly. 24 Universal Display corporation a developer and manufacturer based in the United States holds the majority of patents concerning the commercialization of oleds. Citation needed working principle edit Schematic of a bilayer oled:. Emission creme of radiation,. 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.

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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, 14 the forerunner of modern double-injection devices. In the same year, dow Chemical researchers patented a method of preparing electroluminescent cells using high-voltage (5001500 V) ac-driven (1003000 Hz) electrically insulated one millimetre thin layers of a melted phosphor consisting of ground anthracene powder, tetracene, and graphite powder. 15 Their proposed mechanism involved electronic excitation at the contacts between the graphite particles and the anthracene molecules. Roger Partridge made aziatische the first observation of electroluminescence from polymer films at the national Physical Laboratory in the United Kingdom. The device consisted of a film of poly( n-vinylcarbazole ) up.2 micrometers thick located between two charge injecting electrodes. The results of the project were patented in 1975 16 and published in 1983. The first practical oleds edit American physical chemist Ching.

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5 6 7 8 In 1960 Martin Pope and some of his co-workers at New York University developed ohmic dark-injecting electrode contacts to organic crystals. 9 10 11 They further described the necessary energetic dysport 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 12 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 13 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. Also in 1965,.

In the pmoled scheme, each row (and line) in the display is controlled sequentially, one by one, 4 whereas amoled control uses a thin-film transistor backplane to directly access and switch each individual pixel on or off, allowing for higher resolution and larger display sizes. An oled display works without a backlight because it emits 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. Contents 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, 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.

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Prototype oled lighting panels, an organic light-emitting diode oled ) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current. This layer of organic semiconductor is situated between two electrodes; typically, at least one of these electrodes is transparent. Oleds are used to create digital displays in devices รีวิว such as television screens, computer monitors, portable systems such as mobile phones, handheld game consoles and, pDAs. A major area of research is the development of white oled devices for use in solid-state lighting applications. 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.

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