Photoluminescence, X-ray excited radioluminescence and photoelectron yield characteristics were studied in multicomponent GdGaYAG:Ce and GdGaLuAG:Ce garnet films grown by liquid phase epitaxy. Nonradiative energy transfer from Gd3+to activator Ce3+ions was evidenced. At low Gd doping, , two virtually independent emission centers coexist, which compete for intensity: Ce3+with fast 5d-4f emission and Gd3+with slow 4f-4f emission. At higher Gd concentrations, the Ce3+emission retrieves intensity due to the energy transferred from Gd3+donors. At Gd concentration ~ 50% and above, the Gd3+emission is suppressed due to energy migration and transfer to Ce3+centers. In these samples, the host emission is also completely quenched and the best scintillator performance is achieved. Contrary to melt-grown crystals, no positive role of Ga substitution was found in epitaxial films.
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Kučera et al. (2013) studied this question.
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