Light-emitting diode

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Blue, green and red LEDs.
Blue, green and red LEDs.

A light-emitting diode (LED) is a semiconductor device. It is a type of diode that makes one color of light when electrically biased in the forward direction. This effect is a form of electroluminescence. The color of the light depends on the chemical composition of the semiconducting material used, and can be near-ultraviolet, visible or infrared.[1]

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