Abstract
The investigation of the intense blue photoluminescence of β-ThBr 4 single crystal has been carried out by optical studies. Absorption and emission spectra versus temperature are presented. The thermal quenching of the blue photoluminescence has been performed by measuring the temperature dependence of the fluorescence lifetime. The analysis of these data yields activation energy value of 3622 cm -1. Using the time-dependent theory, the experimental low temperature emission profile has been simulated. The data are interpreted in terms of a charge transfer process between the bromine 4p levels and the thorium 5f-6d levels. A single configuration-coordinate, quadratic coupling model is proposed to explain the observed decay time thermal dependence.
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