Abstract
Radiationless decay of excitons plays a very important role in the generation of charge carriers in semiconductors and insulators, and consequently in the photoconducting properties of such materials Besides the generation of charge carriers, the nonradiative migration of the exciton energy from one region of the crystal to the other can cause a decrease in the photoluminescence of the crystal when the excitation energy of the host material is imparted to impurities or other charge carriers and excitons.
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