Decay kinetics of the luminescence of Ag centers doped in alkali halide crystals

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Abstract

Decay kinetics of the luminescence of Ag centers doped in NaCl, KBr, and CsBr single crystals have been investigated in the temperature range from 4 K to 260 K. At low temperature, the radiative transitions from the 1T1u states in the Ag centers exhibit the luminescence with the decay time constants of about 1.3 ns. With increasing temperature, the decay time constants decrease, reflecting a thermally activated non-radiative transition process from the 1T1u to 3T1u states. On the other hand, the luminescence due to the radiative transitions from the 3T1u states have the decay time constants of about 1.0 ms at low temperature and about 10 μs above 80 K. From the analysis of the temperature dependence of the decay time constants, the parameters of a three-level model and a thermally activated non-radiative process from the 1T1u to 3T1u states are obtained. The parameters are discussed as compared with those of other Tl+-type centers doped in alkali halide crystals. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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