Question

The light emitting diode (LED) is

• 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
• E. a lightly doped p-n junction with reverse bias

Answer 1

The correct option is C a heavily doped p-n junction with forward bias

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.