Multiple choice

Among the following which one is used in blue semiconductor lasers?

  1. Aluminium gallium arsenide

  2. Aluminium gallium indium phosphide

  3. Aluminium gallium nitride

  4. Aluminium gallium phosphide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aluminium gallium nitride (AlGaN) is a semiconductor material. It is an alloy of aluminium nitride and gallium nitride. AlGaN is used to manufacture light-emitting diodes operating in blue to ultraviolet region, where wavelengths down to 250 nm (far UV) were achieved. It is also used in blue semiconductor lasers. It is also used in detectors of ultraviolet radiation, and in AlGaN/GaN HEMT transistors.

Keep practicing — related questions