Posted by Admin | Leave a Comment
A light emitting diode (LED) is a two-lead semiconductor light source. It is a p–n junction diode, which emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electro luminescence, and the colour of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. Appearing as practical electronic components in 1962, the earliest LED emitted low-intensity infrared light.
Infra-red LED are still frequently used as transmitting elements in remote-control circuits, such as those in remote controls. Modern LED are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness. Early LED were often used as indicator lamps for electronic devices, replacing small incandescent bulbs. Recent developments in leds permit them to be used in environmental and task lighting. Leds have many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved physical robustness, smaller size, and faster switching. Light-emitting diodes are now used in applications as diverse as aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes and lighted wallpaper.
Comments & Related items
Popular Posts : Capacitor | Diode | Transistor | Motor | Resistor