Q. What is the use of Gallium?

Gallium is mainly used in semiconductor technology. It is used for doping other semiconductor and in solid state devices such as transistors.

Compounds of Ga with P and As; such as, Gap and Ga As have semiconductor properties similar to those of elemental Si and Ge. These are used as light emitting diodes (LEDs) familiar in pocket calculators, wrist watches, etc. They are also used in infrared emitting diodes, infrared detectors, photo cathodes and photomultiplier tubes.