It is also used in insecticides, hair dyes and as an anti-knocking additive for petrol. But all these are banned by the government as Lead metal is known for detrimental to health.
  
Gallium arsenide is a very important component of many semiconductors and led manufacturing.
Gallium nitride is also know as a semiconductor and it is used in Blu-ray technology, mobile smartphones and LED.
  
Industrial Uses
Chemical Industry, Electrical Industry, Electronic Industry
  
Electrical Industry, Electronic Industry