With suitable sketches explain LED diode emphasizing on stimulated emission, spontaneous emission and Absorption.
With suitable sketches explain LED diode emphasizing on stimulated emission, spontaneous emission and Absorption.
Light Emitting Diode (LED) is a special kind of PN junction diode. It is specially doped and made of a special type of semiconductor. This diode can able to emit light when it is in the forward biased state.
Aluminum indium gallium phosphide (AlInGaP) and indium gallium nitride (InGaN) are the two of the most commonly used semiconductors for LED.
LEDs can emit light over a relatively narrow range of frequencies. The frequency of light emitted is determined by the energy gap of the used semiconductor. Semiconductors are used because the energy gap of semiconductors corresponds to the energy of near ultraviolet, visible, or infrared photons.
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