A light emitting diode (LED) is a semiconductor light source. LED is used as indicator lamps in many devices and are increasingly used for other lighting. Appearing as practical electronic components in 1962, early LED emitted low-intensity red light, but modern versions are available across the visible, ultraviolet, and infra red wavelengths, with very high brightness. Light emitting diodes are used in applications as diverse as aviation lighting, automotive lighting, advertising, general lighting, and traffic signals. LED have allowed new text, video displays, and sensors to be developed, while their high switching rates are also useful in advanced communications technology.
Light Emitting Diode
