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Electronic Devices & CircuitsSpecial Diodes

An LED emits light primarily because of?

  • ACarrier recombination in a forward-biased junction
  • BReverse-bias leakage only
  • CThermal breakdown of the junction
  • DMechanical vibration of the package
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Correct Answer: A. Carrier recombination in a forward-biased junction
Explanation: In an LED, injected electrons and holes recombine in the semiconductor and release energy as photons.
Reference: Standard optoelectronics: LED
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