A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is 1.42 eV. The wavelength of light emitted from the LED is:

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Solution

Q.
A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is 1.42 eV. The wavelength of light emitted from the LED is: [2024]

1 650 nm

2 1243 nm

3 875 nm

4 1400 nm

Ans.
(3)

$λ (nm) = \frac{1240}{E (eV)}$

$λ = \frac{1240}{1.42} = 875 nm (a pprox .)$

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