期刊
OPTICAL MATERIALS
卷 31, 期 11, 页码 1673-1677出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2009.04.005
关键词
Doping; Neutron detectors; Scintillator materials; Micro-pulling-down
资金
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [9686001, 2007]
- Ministry of Health, Labour and Welfare of Japan
- Japan Society for the Promotion of Science OSPS
- Czech MSMT projects [ME953, IM06002]
- JSPS Postdoctoral Fellowship [P08055]
The Pb-doped LiCaAlF6 single crystals were grown using the micro-pulling-down method. The temperature dependences of photoluminescence characteristics were studied to reveal the kinetic processes in the excited state of Pb2+ luminescence center. A simple three-level phenomenological model applied to the decay time temperature dependences shows that energy separation between the metastable P-3(0) and the radiative P-3(1) states of Pb2+ center is relatively high, about 180 meV (similar to 1470 cm(-1)). Induced absorption spectrum after UV illumination at 500 K points to slight ionization of the Pb2+ excited state and creation of the color F-center with an absorption peak located around 260 nm. (C) 2009 Elsevier B.V. All rights reserved.
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