Excitation Transfer Engineering in Ce-Doped 2 Oxide Crystalline Scintillators by Codoping with Alkali3 Earth Ions

Etiennette Auffray, Ramunas Augulis, Andrei Fedorov, Georgy Dosovitskiy, Larisa Grigorjeva, Vidmantas Gulbinas, Merry Koschan, Marco Lucchini, Charles Melcher, Saulius Nargelas, Gintautas Tamulaitis, Augustas Vaitkevicius, Aleksejs Zolotarjovs, and Mikhail Korzhik*

Time-resolved spectroscopic study of the photoluminescence response to femtosecond pulse excitation and free carrier absorption at different wave10 lengths, thermally stimulated luminescence measurements and investigation of differential absorption are applied to amend the available data on excitation transfer in GAGG:Ce scintillators, and an electronic energy-level diagram in this single crystal is suggested to explain the influence of codoping with divalent Mg on luminescence kinetics and light yield. The conclusions are generalized by comparison of the influence of aliovalent doping in garnets (GAGG:Ce) and oxyorthosilicates (LSO:Ce and YSO:Ce). In both cases, the codoping facilitates the energy transfer to radiative Ce3þ centers, while the light yield is increased in the LYSO:Ce system but reduced in GAGG:Ce.

Published in Physica Status Solidi

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