For LEDs to emit light in visible region of electromagnetic light it should have energy band gap in the range of

The energy band gap of Si is

The energy band gap is maximum in

Visible part of electromagnetic spectrun consists of radiations having a wavelength in the range of

The energy band gap is maximum in –

Forbidden energy gap or band gap energy .

Assertion: Lyman series lies in the visible region of electromagnetic spectrum. Reason: This is because Balmer series also lies in visible region.

A LED emits visible white light when its

X-rays are electromagnetic radiations of wavelength greater than that of visible light.

What is forbidden energy gap (Eg) or band gap?