(D) The correct answer is $D$. An $LED$ (Light Emitting Diode) is a heavily doped $p-n$ junction diode,not a lightly doped one. When it is forward bia

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An $LED$ is a lightly doped $p-n$ junction diode which emits spontaneous radiation on forward biasing.

(D) The correct answer is $D$. An $LED$ (Light Emitting Diode) is a heavily doped $p-n$ junction diode,not a lightly doped one. When it is forward biased,the recombination of electrons and holes releases energy in the form of photons (light). Options $A$,$B$,and $C$ are correct statements regarding semiconductor diodes.

Class 12 Physics Semiconductor Electronics Light Emitting Diode (L.E.D), Photodiode, Solar Cell

Medium

Identify the incorrect statement.

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A
When a $p-n$ junction diode is forward biased,the width of the depletion region decreases.
B
When a $p-n$ junction diode is reverse biased,the barrier potential increases.
C
$A$ photodiode is operated in the reverse bias.
D
An $LED$ is a lightly doped $p-n$ junction diode which emits spontaneous radiation on forward biasing.