A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness.
Light-emitting diodeLighting1907 introductionsSemiconductor devicesOptical diodesLight-emitting diodesAmerican inventionsSignage
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