Given below are two statements:
Statement I: In light emitting diodes, energy is released in the form of photons when minority carriers recombine with majority carriers near the junction.
Statement II: Light emitting diodes are fabricated using heavily doped p-n junction which emits spontaneous radiation under forward biased condition.
In the light of above statements, choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Both Statement I and Statement II are true
A light emitting diode is a p-n junction that gives out light when it is forward biased.
Statement I: In light emitting diodes, energy is released in the form of photons when minority carriers recombine with majority carriers near the junction. — Correct. Under forward bias, electrons are injected into the p-side and holes into the n-side, where they are minority carriers. Near the junction they recombine with the majority carriers, and the energy released appears as photons.
Statement II: Light emitting diodes are fabricated using heavily doped p-n junction which emits spontaneous radiation under forward biased condition. — Correct. An LED is a heavily doped p-n junction, and the recombination under forward bias gives spontaneous emission of light.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic was removed from the latest NCERT book (2026-27), and it also appears to be out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Light Emitting Diode – “It is a heavily doped p-n junction which under forward bias emits spontaneous radiation.”
Light Emitting Diode – “… Thus at the junction boundary on either side of the junction, excess minority carriers are there which recombine with majority carriers near the junction. On recombination, the energy is released in the form of photons.”