Question

Q 34/180 The energy gap of compound semiconductor
· GaAS06P0.4 and the colour emitted by it in
forward bias, is
O
1.9 eV, green
1.9 eV, red
22 eV, green
2.2 eV, red
SESSE​

Answer 1

Answer:

The energy band gap of the compound is 1.9 eV and the colour will be Red

Explanation:

As we know that energy band gap must lie between 0.5 eV to 2 eV

so here for small band gap we know that the it is between 1.5 eV to 2 eV

here we have given semiconductor as GaAs

so its band gap must be

$\Delta E = 1.9 eV$

Now in order to find the wavelength we know

$\lambda = \frac{hc}{\Delta E}$

$\lambda = \frac{1240}{1.9} nm$

$\lambda = 650 nm$

So this is wavelength near to longest visible range

So it is red color light

So correct answer will be

B) 1.9 eV and Red

#Learn

Topic : energy band gap

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