Question

What should be the order of band gap of an led if it is required to emit light in visible range?

Answer 1

The reverse breakdown voltages of LEDs are very low. The semiconductor used for fabrication of visible LEDs must atleast have a band gap of 1.8 eV. The order of band gap is about 3 eV to 1.8 eV.

Answer 2

Answer:

The order of band gap of an LED to emit light in the visible range is about $3$ eV to $1.8$eV.

Explanation:

the range of energy values that are forbidden to electrons in a solid material (such as an insulator or semiconductor), measured as the energy difference between the valence band and the conduction band.

A $743nm$ wavelength is associated with a band gap of$1.67eV$. The light is red. Since no change in momentum is necessary for an electron in the conduction band to recombine with a hole in the valence band, direct semiconductors—which make up the majority of LEDs—are used in their manufacture.

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