Q 12-14-080JEE MainJEE Main 2023 (29 Jan, Shift 1)Easy
Which of the following statement is not correct in the case of light emitting diodes?
A. It is a heavily doped p-n junction.
B. It emits light only when it is forward biased.
C. It emits light only when it is reverse biased.
D. The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used.
Choose the correct answer from the options given below:
Answer: (C) C
An LED is a heavily doped p-n junction that emits light when forward biased, as electrons and holes recombine across the gap; the photon energy is equal to or slightly less than $E_g$. So A, B and D are correct.
Statement C (reverse bias) is the incorrect one.
Solution by Sreeraj P, M.Sc Physics