Question

Write the name of any one doped semiconductor used for making light-emitting diodes (LED).

Answer 1

Hint
The intrinsic semiconductors are doped with impurities to obtain an extrinsic semiconductor with modified properties. A thin layer of greatly doped semiconductor is used in the formation of a light-emitting diode (LED).

Complete step by step answer
Light-emitting diodes are the semiconductors that convert electric energy into light energy such that when an amount of electric current is passed through the diode, that emit light. The colour of the emitted light consisting of a certain wavelength depends on the amount of doping and the semiconductor material used in the formation of light-emitting diodes. Gallium arsenide phosphide (GaAsP) is used for making light-emitting diodes. A doped gallium arsenide phosphide is used to male light-emitting diodes that emit red, orange, and yellow light when current flows through it.

Additional Information
Some other doped semiconductors can also be used to make light-emitting diodes namely, gallium arsenide (GaAs), lead sulphide (PbS), Indium phosphide (InP), and gallium phosphide (GaP). A very low amount of heat is dissipated in the emission of light while using light-emitting diodes in comparison to traditional incandescent bulbs.

Note
There are various other doped semiconductors can also be used to make light-emitting diodes. However, gallium arsenide phosphide is one of the preferred choices.