期刊
JOURNAL OF LUMINESCENCE
卷 130, 期 5, 页码 851-854出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2009.12.012
关键词
Luminescence; Nitride; Long afterglow; Thulium
类别
资金
- National Natural Science Foundation of China [50372086]
- Ministry of Science and Technology of China [2006AA03A133, 2006CB601104]
The Sr2Si5N8:Eu2+ phosphors, both undoped and doped with Tm3+, were synthesized by high temperature solid-state method. The XRD pattern shows that only Sr2Si5N8 phase is formed whatever Tm3+ was doped or not. The peak positions of both phosphors are centered at 612 nm which is assigned to the 4f(6)5d -> 4f(7) transition of Eu2+. It implies that the crystal field, which affects the 5d electron states of Eu2+, is not changed dramatically after the phosphor is doped with Tm3+. The afterglow time is about 10 min after Tm3+ ion is introduced into the phosphor. The concentration of Tm3+. has little influence on the afterglow time of the phosphor. The depths of trap energy level of the two phosphors were calculated based on the TL spectra. The depths of Sr2Si5N8:Eu2+ and Sr2Si5N8:Eu2+, Tm3+ are 1.75 and 1.01 eV, respectively. (C) 2009 Elsevier B.V. All rights reserved.
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