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Light-Emitting Diodes

The Light-emitting diode and Light-emitting diodes, commonly called LEDs, do dozens of different jobs and are found in all kinds of devices. Among other things, they form the numbers on digital clocks, transmit information from remote controls, light up watches and tell you when your appliances are turned on. Collected together, they can form images on a television screen or illuminate a traffic light. Basically, LEDs are just tiny light bulbs that fit into an electrical circuit. But unlike ordinary incandescent bulbs, they don't have a filament that will burn out, and they don't get especially hot. They are illuminated solely by the movement of electrons in a semiconductor material, and they last just as long as a standard transistor. A light-emitting diode (LED) is a semiconductor device that emits incoherent narrow-spectrum light when electrically biased in the forward direction. This effect is a form of electroluminescence. The color of the emitted light depends on the chemical composition of the semi-conducting material used, and can be near-ultraviolet, visible or infrared.

The organic light-emitting diode (OLED) emits a brilliant white light when attached to an electricity supply.

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