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 [2019]

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Solution

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 [2019]

1 $10.4 \times 10^{- 26}$ m

2 654 nm

3 654 $Å$

4 $654 \times 10^{- 11}$ m

Ans.
(2)

Given, energy gap $= 1.9$ $eV$

Now, for the LED to operate, electrons need to cross this energy gap.

$∴$ $Wavelength of light emitted, λ = \frac{1242 eV - nm}{1.9 eV} = 654$ $nm$

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