Explanation

The phenomenon of luminescence that occurs when a solid is heated. Many solids have defects that can bind electrons or holes, that is, color centers. A considerable part of the free carriers generated by light or X-ray in solids will be bound to these color centers. When the temperature is low, these carriers are relatively stable; When heating up. They will get enough energy to escape from the color centers and create an empty color centers. Other carriers will composition with this color centers and emit energy (that is, the luminescence luminous intensity will gradually increase with the increase of temperature, reaching the maximum at a certain temperature T. After that, due to the increasing energy of free carriers, it is not easy to be bound by the color centers. The light intensity will gradually become weaker. The potential well depth of the color centers in the solid can be determined through the measurement of thermoluminescence to study the properties of defects and impurities in the solid.

Classification