Question

For LED’s to emit light in visible region of electromagnetic light, it should have energy band gap in the range of: 

(a) 0.1 eV to 0.4 eV 

(b) 0.5 eV to 0.8 eV 

(c) 0.9 eV to 1.6 eV 

(d) 1.7 eV to 3.0 eV

Answer 1

Correct option  (d) 1.7 eV to 3.0 eV

Explanation:

Energy band gap range is given by,