LED is manufactured using zinc selenide then it emits. (a) infrared radiations (b) yellow light (c) blue light (d) green light

Answer: (c). ZnSe has a band gap of about 2.7 eV. λ = (1240)/(2.7) nm ≈ 460 nm, which is blue. So the answer is (c) blue light.

LED is manufactured using zinc selenide then it emits. | MHT CET 2021 (21 Sep, Shift 2)

Q61MHT CET 2021 · 21 SEP · SHIFT 2Easy

Special Purpose Diodes

LED is manufactured using zinc selenide then it emits.

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Answer: (c)

ZnSe has a band gap of about $2.7$ eV.
$\lambda = \dfrac{1240}{2.7}\ \text{nm} \approx 460\ \text{nm}$ , which is blue.
So the answer is (c) blue light.

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