Abstract
The cause of the relatively low scintillation light yield ofPrBr3:Ce3+ is investigated by means of optical spectroscopy, the temperature dependence of scintillationproperties and the temperature dependence of optically excited decay curves of undoped andCe3+-dopedPrCl3 and PrBr3. The integrated intensity of x-ray excited luminescence ofPrBr3:5% Ce3+ shows that the light yield at room temperature (RT) is two times less than at 80 K. The decay timeof Ce3+ emission optically excited to its 5d band inPrBr3:5% Ce3+ has a singleexponential decay of 11.0 ± 1.1 and 6.0 ± 0.6 ns at 10 K and RT, respectively. It is proposed thatCe3+ emission is quenched by a metal-to-metal charge transfer of followed by emission of Pr3+ which is strongly concentration quenched.
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