期刊
MATERIALS RESEARCH BULLETIN
卷 45, 期 11, 页码 1614-1617出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2010.07.013
关键词
Optical materials; Composites; Optical properties; Luminescence
资金
- National Science Foundation for Distinguished Young Scholars [50925206]
- National Natural Science Foundation of China [10874061]
- Doctoral Program of Higher Education [200807300010]
The luminescent properties of Ca2Gd8(1-x)(SiO4)(6)O-2:xDy(3+) (1% <= x <= 5%) powder crystals with oxyapatite structure were investigated under vacuum ultraviolet excitation. In the excitation spectrum, the peaks at 166 nm and 191 nm of the vacuum ultraviolet region can be assigned to the O2- -> Gd3+, and O2- -> Dy3+ charge transfer band respectively, which is consistent with the theoretical calculated value using J phi rgensen's empirical formula. While the peaks at 183 nm and 289 nm are attributed to the f-d spin-allowed transitions and the f-d spin-forbidden transitions of Dy3+ in the host lattice with Dorenbos's expression. According to the emission spectra, all the samples exhibited excellent white emission under 172 nm excitation and the best calculated chromaticity coordinate was 0.335, 0.338, which indicates that the Ca2Gd8(SiO4)(6)O-2:Dy3+ phosphor could be considered as a potential candidate for Hg-free lamps application. (C) 2010 Elsevier Ltd. All rights reserved.
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