Abstract
Emission and excitation spectra and luminescence decay kinetics were studied for Pr 3+-doped Lu 3Al 5O 12 and Y 3Al 5O 12 single crystalline films (SCF) grown by the liquid phase epitaxy method from a PbO-based flux. The influence of lead-induced centers on their scintillation characteristics was clarified. It was found that the influence of single Pb 2+-based centers on the characteristics of Pr 3+ centers due to the Pb 2+ → Pr 3+ energy transfer was weak. However, an overlap of the emission spectra of single and dimer lead-induced centers with the emission spectrum of Pr 3+ ions, and especially a strong overlap of the 4f–5d 1 absorption band of Pr 3+ ions with the slow emission of localized excitons in the 290 nm band had a considerable influence on the scintillation characteristics of the Pr 3+-doped SCF.
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