Special Purpose Diodes
Which one 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:
Show answer and solution
Answer: (d)
- A: True, an LED is a heavily doped p-n junction.
- B: True, it emits light only in forward bias.
- C: False, no recombination and no light in reverse bias.
- D: True, photon energy is equal to or slightly less than .
- So the answer is (d) C.