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Which of the following materials is used to make LEDs?

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Which of the following materials is used to make LEDs?

(a) Silicon

(b) GaAsP

(c) Germanium

(d) Selenium

I got this question in unit test.

This key question is from Types of Diode and their Testing topic in section Diode Circuit of Analog Circuits

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The correct choice is (b) GaAsP

The explanation is: In Silicon and Germanium, the major chunk of energy is given off as heat the hence the emitted light isn’t significant. In Gallium Arsenide Phosphide (GaAsP), the number of photons are enough to create a visual source of light.

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