A light-emitting diode (LED) is a two-lead semiconductor light source. It is a pn-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
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