Activator segregation and micro-luminescence properties in GAGG:Ce ceramics

Autor: L.V. Kutuzov, V. Dubov, Augustas Vaitkevicius, Gintautas Tamulaitis, G. Dosovitskiy, A. Veligzhanin, P. Karpyuk, Mikhail Korzhik, A. Borisevich, Pavel A. Volkov, Roman Svetogorov, K. E. Prikhod’ko
Rok vydání: 2021
Předmět:
Zdroj: Journal of Luminescence. 236:118140
ISSN: 0022-2313
DOI: 10.1016/j.jlumin.2021.118140
Popis: ввCeramic scintillators are promising due to their potentially low cost. Here, we report on our study of Ce-doped ceramics. Typical garnet-type ceramics Gd2.97Ce0.03Al2Ga3O12 was fabricated for the study from co-precipitated powders by high-temperature sintering in air. Its structure and composition are characterized using Scanning Electron Microscope (SEM) imaging, Transmission Electron Microscopy (TEM), Electron Energy Loss Spectroscopy (EELS), Electron Backscattered Diffraction (EBSD) mapping, X-Ray Diffraction (XRD) and X-ray Absorption Near Edge Structure (XANES) measurements. The spatial distribution of luminescence properties at the micro-level is studied using scanning confocal microscopy. Cerium segregation at the grain boundaries was revealed by compositional characterization and is in line with enhanced Ce3+ photoluminescence observed at the boundaries. Meanwhile, no excess partitioning of Ce4+ ions at the grain boundaries is observed. It is found that most of Ce ions in the ceramics are stabilized in the state Ce3+, what is encouraging in view of the further development of GAGG:Ce ceramics as a promising luminescence material for lighting and scintillator application.
Databáze: OpenAIRE
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