期刊
OPTICAL MATERIALS
卷 92, 期 -, 页码 181-186出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2019.04.023
关键词
Light yield; Luminescence; Multicomponent garnets; Scintillators; Time resolution
资金
- King Mongkut's University of Technology Thonburi through the KMUTT 55th Anniversary Commemorative Fund
- KMUTT
- National Research Council of Thailand (NRCT) [2561A30602099]
- Operational Programme Research, Development and Education - European Structural and Investment Funds
- Czech Ministry of Education, Youth and Sports [SOLID21 CZ.02.1.01/0.0/0.0/16_019/0000760]
The scintillation characteristics of Gd3Al2Ga3O12:Ce, Li (GAGG:Ce,Li) and Gd3Al2Ga3O12:Ce, Mg (GAGG:Ce,Mg) single crystals were compared. Radioluminescence spectra and photoluminescence decay curves were measured at various temperatures between 77 and 500 K to investigate the thermal luminescence quenching. At 662 keV gamma rays, the LY value of 35,400 photons/MeV and energy resolution of 6.9% obtained for GAGG:Ce, Li are superior to those of 24,200 photons/MeV and 9.5% for GAGG:Ce,Mg. Scintillation decays are approximated by a double exponentials with a fast principal decay component of 47 ns (83%) for GAGG:Ce, Mg and 90 ns (86%) for GAGG:Ce,Li. Coincidence time resolution of 282 ps obtained for GAGG:Ce, Mg is better than that of 389 ps for GAGG:Ce,Li. GAGG:Ce, Mg shows a much lower afterglow and thermally stimulated luminescence intensity with respect to GAGG:Ce,Li.
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