期刊
OPTICAL MATERIALS
卷 64, 期 -, 页码 245-249出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2016.12.024
关键词
LuAG:Ce,Li ceramics; Scintillator; Li+ codoping; Ce4+ and Ce3+ centers
资金
- China Scholarship Council
- National Science Foundation of China [U1332202, 61675221]
- Research Program and International Cooperation Program of Shanghai Sciences and Technology Commission Foundation [15520721000]
- Chinese Academy of Sciences Visiting Professor for Senior International Scientists [2013T2G0004, 2014VTB009]
- Czech Science Foundation [16-15569S]
Monovalent Li+ codoped Lu3Al5O12:Ce (LuAG:Ce) optical ceramics were fabricated by solid state reaction method and further optimized by an air-annealing process. Optical absorption, radiolulninescence spectra and scintillation properties such as light yield, scintillation decay times and afterglow were measured and compared with those of the Li+ free LuAG:Ce ceramic and the commercial LuAG:Ce single crystal samples. Positive effect of Li+ codopant consists mainly in the significant increase of scintillation light yield, acceleration of scintillation decay as well as the decrease of afterglow intensity. With 0.3% Li codoping, the obtained LuAG:Ce,Li ceramic displays a light yield of similar to 29200 ph/MeV at 10 mu s shaping time, higher than that of the LuAG:Ce single crystal and optical ceramic scintillators ever reported. The partial conversion of the stable Ce3+ to Ce4+ centers and the shallow and deep traps effect suppression by the Li+ codoping are discussed. (C) 2016 Elsevier B.V. All rights reserved.
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