Q. 18

How is a light em

Answer :

A light emitting diode is formed by heavily doping both n and p regions of a junction diode. The entire structure is then placed in a transparent casing for the light to be emitted after recombination.

Working of LED:

A LED works in forward biased configuration. After applying the forward bias, the depletion region or the potential barrier decreases. The electrons and holes combine in this depletion region giving off photons of energy equal to the bandgap () of the semiconductor.

LED offers several advantages over incandescent lamps:

(i)LED has no filament like features and hence have a longer lifetime than filament bulbs.

(ii)LED works on low operational voltage thus power consumption is less.

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