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Which of the following materials can be used to produce infrared LED?

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in Engineering Physics II by (679k points)
Which of the following materials can be used to produce infrared LED?

(a) Si

(b) GaAs

(c) CdS

(d) PbS

I got this question by my college professor while I was bunking the class.

The above asked question is from LED in division Semiconductors of Engineering Physics II

1 Answer

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Best answer
The correct answer is (b) GaAs

The best I can explain: GaAs has an energy band gap of 1.4 eV. It can be used to produce infrared LED. Various other combinations can be used to produce LED of different colors.

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