Wide band-gap semiconductors have a band gap between
2 and 7 electron volts (eV), where 1 eV = 96.485 kJ>mol.
The wide band-gap semiconductor GaN, used to construct
the laser in Blu-ray DVD players, has a band gap of
3.44 eV. The material in the laser, GaxIn1-x N, has some
indium substituted for gallium.
(b) If the light from the device is blue, does partial substitution
of indium for gallium increase or decrease the band
gap of GaxIn1-x N compared to GaN?
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Master Electromagnetic Spectrum with a bite sized video explanation from Jules Bruno