Abstract
NaI crystals containing different concentrations of divalent europium and manganese ions were investigated using the photoluminescence technique. Excitation spectra and decay times of observed Eu2+ and Mn2+ emissions were analysed in the temperature range 80-300 K. The experimental data from the slightly doped quenched crystals suggest the preferential pairing of Eu2+ and Mn2+ ions. At these centres an efficient energy transfer from Eu to Mn takes place. A model is proposed to explain the kinetics of Eu2+ to Mn2+ energy transfer in NaI based on experimental observations. It is established that a short-range interaction mechanism such as an electric dipole-quadrupole interaction or exchange is active between the impurity pairs in which the energy transfer occurs. The results obtained substantiate the ionic radius criterion proposed by Rubio and co-workers to predict impurity pairing in a solid material.
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