期刊
OPTICAL MATERIALS
卷 47, 期 -, 页码 338-344出版社
ELSEVIER
DOI: 10.1016/j.optmat.2015.05.052
关键词
Thermographic phosphors; Chromium-doped gadolinium gallium oxide; Co-doping with cerium
资金
- Deutsche Forschungsgemeinschaft DFG [DR 374/16-1, AL 536/14-1]
- framework of the Excellence Initiative, Darmstadt Graduate School of Excellence Energy Science and Engineering [GSC 1070]
- Gottfried Wilhelm Leibniz program of DFG
The accuracy of surface temperature measurements using thermographic phosphors relies on an extensive knowledge of the temperature-dependent properties of the phosphor. This paper addresses the effects of doping concentration and co-doping with cerium on the luminescence properties of the Gd3Ga5O12:Cr3+ phosphor. High-crystallinity Gd3Ga5O12:Cr3+,Ce3+ powder samples (GGG:Cr,Ce) with different Cr3+ and Ce3+ concentrations were synthesized, and their luminescence spectra as well as their decay lifetime properties were characterized after UV laser excitation. Results revealed that the concentration quenching decreases the luminescence lifetime at concentrations above 0.5 mol% Cr3+ while the emission spectrum remains independent of the CI-(3+) concentration. Co-doping with small amounts of Ce3+ improves the temperature-dependent luminescence characteristics by reducing the afterglow and producing fairly mono-exponential luminescence decays without changing the lifetime. (C) 2015 Elsevier B.V. All rights reserved.
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