The light emitting diode (LED) is

Options

A. a heavily doped p-n junction with no external bias
B. a heavily doped p-n junction with reverse bias
C. a heavily doped p-n junction with forward bias
D. a lightly doped p-n junction with no external bias

Answer

C

Explanation

The light emitting diode (LED) is a heavily doped p-n junction with forward bias. Because it is an important light source used in optical communication and is based on the principle of conversion of biasing electricity into light. It is a specially designed forward-biased p-n junction diode which emits light spontaneously when energised.