Host-Sensitization in KBr : I and NaCl : Br

Abstract

Temperature dependence of the emission intensities for two emission bands due to isolated and paired halogen impurity ions in KBr:I and NaCl:Br has been investigated in the region from 10 to 400 K for various energies of the exciting light. Under excitation at the exciton absorption band, the emission intensities decrease as ∼T^−1⁄2. This suggests that energy transfer by excitonic mechanism is most likely to occur in these systems. Under excitation at the interband transition region, the emission intensities are found to be enhanced by the migration of mobile V_K-centers to halogen impurities.