Title Influence of heavy magnesium codoping on emission decay in Ce-doped multicomponent garnet scintillators /
Authors Nargelas, Saulius ; Solovjovas, Arnoldas ; Talochka, Yauheni ; Podlipskas, Žydrūnas ; Kucera, Miroslav ; Lucenicova, Zuzana ; Tamulaitis, Gintautas
DOI 10.1039/d3tc02247a
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Is Part of Journal of materials chemistry C.. Cambridge : Royal Society of Chemistry. 2023, vol. 11, iss. 35, p. 12007-12015.. ISSN 2050-7526. eISSN 2050-7534
Abstract [eng] This study is aimed at the acceleration of luminescence decay in Ce-doped garnet-type scintillators by heavy aliovalent codoping. Time-resolved photoluminescence spectroscopy over a wide temperature range of LuGAGG:Ce epitaxial layers with up to 6000 ppm of codoping magnesium, and a transient absorption technique probing the population of the emitting Ce centers and energies of optical transitions at Ce3+ ions in the layers, enabled the interpretation of luminescence decay. Heavy Mg-codoping facilitated the luminescence decay acceleration due to the coexistence of two types of emission centers: regular ions of Ce3+; and Ce ions with magnesium in the immediate vicinity, i.e., Ce3+ + Mg2+ centers. In the latter centers, the activation energy for thermal quenching is 0.2 eV, instead of 0.48 eV in regular Ce3+ centers; and a new channel of temperature-independent nonradiative recombination occurs, pushing the low-temperature luminescence decay time from 50 ns - due to radiative recombination at regular Ce3+ centers - down to 10.5 ns. The magnesium content does not change the properties of the emission centers but increases the contribution of the Mg-related centers. Time-resolved cathodoluminescence spectroscopy of the layers evidences a broad applicability of the suggested model for heavy aliovalently codoped Ce-doped garnets beyond the LuGAGG:Ce thin films prospective for X-ray imaging.
Published Cambridge : Royal Society of Chemistry
Type Journal article
Language English
Publication date 2023
CC license CC license description