What is photoluminescence used for?

Photoluminescence is used to measure the purity and crystalline quality of semiconductors such as Gallium nitride (GaN) and Indium Phosphide (InP).

Photoluminescence is the spontaneous emission of light from a material following photoexcitation. It is a powerful contactless and nondestructive technique used for extracting valuable information about the composition of a semiconductor sample.

There are three forms of photoluminescence – resonant radiation, fluorescence, and phosphorescence.