Write a short note on LED.
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72
A light emitting diode (LED) is a semiconductor device that emits visible light when an electric current passes through it.
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Light-emitting diode. ... 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.
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