کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5399212 | 1392675 | 2016 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optical, luminescence and scintillation characteristics of non-stoichiometric LuAG:Ce ceramics
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Non-stoichiometric Lu3+xAl5O12:Ce (Lu3+xAG:Ce, x=1, 2, 3 and 4 %) ceramics were fabricated by solid state reaction method and further optimized by an air-annealing process. Absorption, luminescence spectra and scintillation characteristics such as light yield, scintillation decay times, energy resolution, proportionality and afterglow were measured and compared with those of the latest LuAG:Ce single crystal and stoichiometric LuAG:Ce,Mg ceramic samples. Thanks to the elimination of oxygen vacancies produced in the vacuum sintering process, air-annealing treatment led to a significant decrease of afterglow and a remarkable enhancement of radioluminescence intensity and light yield. The highest light yield was found in annealed 1% Lu3+ rich Lu3+1%AG:Ce ceramic, reaching 14,760 ph/MeV (1 μs shaping time) and 22,400 ph/MeV (10 μs shaping time). Scintillation decays of Lu3+xAG:Ce ceramics consist of both fast (decay time 65-73 ns) and slow (decay time 740-1116 ns) decay components where the relative intensity of the latter is higher (~58%). A decreasing trend in scintillation efficiency was observed with increasing excess of Lu (with higher x values) in the samples. This can be explained by the existence of various electron traps due to LuAl antisite defect and structure disorder at the gain boundaries and interfaces.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 169, Part A, January 2016, Pages 72-77
Journal: Journal of Luminescence - Volume 169, Part A, January 2016, Pages 72-77
نویسندگان
Shuping Liu, Xiqi Feng, Jiri A. Mares, V. Babin, Martin Nikl, Alena Beitlerova, Yun Shi, Yanping Zeng, Yubai Pan, Carmelo D'Ambrosio, Yihua Huang,