Led Emission Principle
Mediumphysics
LED emits light when?
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Solution
Incorrect! Answer:
Forward biased causing recombination
- LED Core: A Light Emitting Diode is a heavily doped PN junction made from compound semiconductors like GaAsP.
- Mechanism: Under forward bias, electrons from the N-side and holes from the P-side are injected into the junction region.
- Recombination: In the junction, free electrons 'fall' into vacancies (holes). During this recombination process, energy is released.
- Photon Emission: In these specific materials (direct band gap), the released energy appears in the form of photons of light.
- Calculation: The wavelength of light depends on the energy gap (Eg=hf=hc/λ).
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About This Question
- Subject
- physics
- Chapter
- semiconductor devices
- Topic
- led emission principle
- Difficulty
- Medium
- Year
- 2025
This medium difficulty physics question is from the chapter semiconductor devices, covering the topic of led emission principle. It appeared in the 2025 exam. Practice this and similar questions to strengthen your understanding of semiconductor devices concepts.
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