Light emitting diode is based on:
Correct answer: A. Emission of energy in the form of photons
- A. Emission of energy in the form of photons
- B. Faraday's law
- C. Ionic bonding between p-type and n-type substances
- D. None of these
Explanation
A light-emitting diode is made from special semiconductors such as gallium arsenide and gallium arsenide phosphide in which the potential barrier between p and n sides is such that when an electron combines with a hole during forward bias condition, a photon of visible light is emitted.
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A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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