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(D) light emitting diode $(LED)$ is a heavily doped $p-n$ junction diode which emits spontaneous radiation when forward biased. In the forward biased

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always used in forward biased condition

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(D) light emitting diode $(LED)$ is a heavily doped $p-n$ junction diode which emits spontaneous radiation when forward biased. In the forward biased condition,the potential barrier is reduced,allowing electrons from the $n$-region and holes from the $p$-region to cross the junction. These charge carriers recombine at the junction,releasing energy in the form of photons (light). Therefore,an $LED$ is always operated in the forward biased condition to emit light.

For the emission of light,a light emitting diode $(LED)$ is:

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