Abstract
Organic light emitting diode (LED) technology has reached a point where performance levels are adequate for a number of applications. This review examines the key scientific issues that underlie the operation of such LEDs. The most advanced LEDs are multilayer devices, with the different layers possessing specialized carrier transport/optical properties. A combination of these materials results in the highly efficient devices that have now been reported by several laboratories. The important issue of reliability and some possible applications for organic LEDs are surveyed.
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