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Question: Answered & Verified by Expert
LED is a $p-n$ junction diode which is
PhysicsSemiconductorsMHT CETMHT CET 2010
Options:
  • A forward biased
  • B either forward biased or reverse biased
  • C reverse biased
  • D neither forward biased nor reverse biased
Solution:
1047 Upvotes Verified Answer
The correct answer is: forward biased
When a junction diode is forward biased, energy is released at the junction due to recombination of electrons and holes. In the junction diode made of gallium arsenide or indium phosphide, the energy is released in visible region. Such a junction diode is called a light emitting diode or LED.

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