期刊
CHEMICAL PHYSICS LETTERS
卷 404, 期 1-3, 页码 40-43出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2005.01.051
关键词
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CsCaBr3 doped with 1% Tm2+ exhibits a rich emission spectrum at 10 K. Five emission bands are identified and characterised: a sharp and long-lived 4f-4f emission at 8796 cm(-1). Broad 5d-4f emission bands from the lowest energy (5d)(1)(4f)(12) configurations to the groundstate at 13640 cm(-1) ('spin-allowed') and 12240 cm(-1) ('spin-forbidden'). Two broad emission bands from a higher-energy f-d state, one centered at 19 115 cm(-1) to the F-2(7/2) groundstate and the other one at 10400 cm(-1) to the first excited F-2(5/2) state. The transitions are identified and the competition between radiative and nonradiative processes characterised from lifetime and temperature dependent measurements. (C) 2005 Elsevier B.V. All rights reserved.
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