Dictionary of Computer and Internet Terms: LED (light-emitting diode)
LED (light-emitting diode)
a semiconductor device that emits light when an electric current passes through it. The bright red display on some digital clocks is made of LEDs. Other available LED wavelengths are infrared, orange, yellow, green, and blue.
White LEDs consists of a blue-light emitter plus a fluorescent phosphor. They are a very efficient source of illumination because nearly all the electricity is turned into light, unlike an ordinary light bulb, which turns most of its incoming energy into heat.
