Questions
GaAs (with a band gap = 1.5 eV) as on LED can emit
a
blue light
b
ultraviolet rays
c
X-rays
d
infrared rays
detailed solution
Correct option is D
(4)Band gap=1.5 eV=1.5 × 1.6× 10−19 Joule= 2.4× 10−19 JouleWavelength of radiation emittedλ=hcE=6.6× 10−34×3× 108 2.4× 10−19 m= 8.25× 10−7 m=8250 AoThis wavelength belongs to infrared rays.Talk to our academic expert!
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An LED is constructed from a PN junction based on a certain semi-conducting material whose energy gap is 4 eV. Then the wavelength of the emitted light is
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