MHT CET 2023 Physics question

Not in JEE Advanced syllabus

For emission of light, a light emitting diode (LED) is

(A)always used in reverse biased condition
(B)never used in forward or reverse biased condition
(C)used both in forward and reverse biased condition depending upon its application
(D)always used in forward biased conditionCorrect

Answer: (D)

Solution

An LED is a p-n junction diode made of a direct band-gap semiconductor such as GaAsP. Light is emitted when electrons from the n-side recombine with holes on the p-side; this requires a large flow of majority carriers across the junction, which happens only in forward bias. In reverse bias the current is

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Question ID VK-098284