Which of the following statement is not correct in the case of light emitting diodes?
A. It is a heavily doped 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 :
A. It is a heavily doped 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 :
- (A)C and D
- (B)A
- (C)C✓ Correct
- (D)B
Answer: (C)
Solution
A light emitting diode is a heavily doped p-n junction that glows under forward bias, where recombination across the junction releases photons whose energy is about equal to or a little less than the band gap. It does not emit under reverse bias. The statement that an LED emits light only when reverse biased is the incorrect one.
JEE Main · 2023 · 29 Jan 2023 · Shift 1 · Single correct option