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  4. An LED is constructed from a p-n junction diode using GaAsP. The energy gap is 1.9 eV. The wavelength of the light emitted will be equal to :

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Q. An $LED$ is constructed from a $p-n$ junction diode using $GaAsP$. The energy gap is $1.9\, eV$. The wavelength of the light emitted will be equal to :

NEETNEET 2019Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

$\lambda = \frac{1240nm}{1.9} = 652.6\,nm \simeq 654 \,nm$