Get Answers to all your Questions

header-bg qa

Explain why elemental semiconductor cannot be used to make visible LEDs.


Answers (1)

In an elemental semiconductor, the bandgap is such that the emission is in the infrared region and not in the visible region.


for Si; E_{g}=1.1eV, \lambda=\frac{1242}{1.1}=1129nm

for Ge; E_{g}=0.7eV, \lambda=\frac{1242}{0.7}=1725nm

Posted by


View full answer