LED (Light Emitting Diode)
A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor.[5] White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device
Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared (IR) light.Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics.
