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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:

Similar Questions

$A$ $p-n$ photodiode is fabricated from a semiconductor with a band gap of $1.4 \ eV$. It can detect a signal of wavelength:

Statement $-1$: $A$ photodiode operates in reverse bias.
Statement $-2$: The fractional change due to the photo-effects on the minority carrier dominated reverse bias current is more easily measurable than the fractional change in the forward bias current.

The current in the forward bias is known to be more $(\sim mA)$ than the current in the reverse bias $(\sim \mu A)$. What is the reason then to operate the photodiodes in reverse bias?

The laptop PCs,modern electronic watches,and calculators use the following for display:

An $LED$ is a $p-n$ junction diode which is

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