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Question

LED is constructed from GaAsP semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour.
[h=6.63×1034J s and c=3×108 ms1]

A
654 nm and red colour
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B
1046 nm and blue colour
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C
1046 nm and red colour
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D
654 nm and orange colour
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Solution

The correct option is A 654 nm and red colour
We know that E=hcλ

λ=hcEλ(in nm)=1240E(in eV)

λ=12401.9= 652.63 nm = 654 nm

Wavelength of red light is 620 nm to 750 nm

So, option (a) is the correct answer .

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