- published: 27 Jul 2016
- views: 7501
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 electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor.
An LED is often small in area (less than 1 mm2) and integrated optical components may be used to shape its radiation pattern.
Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared light. Infrared LEDs are still frequently used as transmitting elements in remote-control circuits, such as those in remote controls for a wide variety of consumer electronics. The first visible-light LEDs were also of low intensity, and limited to red. Modern LEDs are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness.
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Genres: ,call it a day, nothing to say
maybe it's easy that way
i don't know - you never did
i don't know - let it go
nothing to say, but it's ok
maybe you want it this way
haven't you led me long enough to throw me a bone?
haven't you bled me long enough to live on your own?
call it a day, lust made us grey
i'll always see you that way
send me away, 'cause i wouldn't stay
never lived here anyway
haven't you led me long enough to throw me a bone?