Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7840487 | Journal of Luminescence | 2018 | 9 Pages |
Abstract
The work is dedicated to the growth and investigation of the luminescent and scintillation properties of single crystalline films (SCFs) of Ca2âxR1+xMg1+xSc1âxSi3O12:Ce (R = Y, Lu) mixed garnets with x = 0-0.25, grown using the liquid phase epitaxy method onto Y3Al5O12 substrates from PbO-B2O3 based flux. The absorption, luminescent and scintillation properties of Ca2âxY1+x Mg1+xSc1âxSi3O12:Ce and Ca2âxLu1+xMg1+xSc1âxSi3O12:Ce SCFs with x = 0 and 0.25 were investigated and compared with the reference YAG:Ce and LuAG:Ce SCFs. Using the Ca2+, Mg2+ and Si4+ alloying, the Ce3+ emission spectra in Ca2âxR1+xMg1+xSc1âxSi3O12:Ce (R = Y, Lu; x = 0-0.25) SCFs can be notably extended in the red range in comparison with YAG:Ce and LuAG:Ce SCFs due to the increase of crystal field strength and Ce3+ multicenter creation in the dodecahedral positions of the lattices of these mixed garnet compounds. Due to the formation of Ce4+ ions, the as-grown Ca2âx R1+xMg1+xSc1âxSi3O12:Ce (R = Y, Lu) SCFs at x = 0 and 0.25 show relatively low light yield. However, after annealing in reducing atmosphere (95% N2 + 5% H2) at T > 1000 °C, a recharging Ce4+âCe3+ takes place. After that, these SCFs possess the light yield about of 30% and 31% in comparison with the reference YAG:Ce and LuAG:Ce SCFs, respectively, and a fast scintillation response with the decay times in the ns range under α-particles excitation by 239Pu (5.15 MeV) source.
Related Topics
Physical Sciences and Engineering
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Physical and Theoretical Chemistry
Authors
V. Gorbenko, T. Zorenko, P. Pawlowski, A. Iskaliyeva, K. Paprocki, A. Suchocki, Ya. Zhydachevskii, A. Fedorov, N. Khaidukov, R. Van Deun, F. Schröppel, A. Osvet, M. Batentschuk, Yu. Zorenko,