An organic light-emitting diode (OLED), also known as organic electroluminescent (organic EL) diode, 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 transpare. History and co-workers at the made the first observations of in organic materials, in the early 1950s. They applied high in air to materials s. A typical OLED is composed of a layer of organic materials situated between two electrodes, the and, all deposited on a. The organic molecules are electrically conductive as a result of. 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 w.
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