期刊
OPTICAL MATERIALS
卷 32, 期 9, 页码 857-861出版社
ELSEVIER
DOI: 10.1016/j.optmat.2009.12.011
关键词
Yttrium orthophosphate; Sol-gel; Europium and lithium; Photoluminescence; Nanophosphors
资金
- Natural Science Foundation of China [50972166]
- Foundation for Returned Overseas Scientists
YPO4 nanoparticles with pure monoclinic phase were successfully synthesized by a simple sol-gel method using both citric acid (CA) and ethylene diamine tetraacetic acid (EDTA) as complexing agent. Techniques of X-ray diffraction (XRD), transmission electron microscopy (TEM), as well as high-resolution transmission electron microscopy (HRTEM) have been employed to characterize the as-synthesized nanoparticles. Furthermore, the photoluminescence (PL) characterization of the Li+ and Eu3+ co-doped YPO4 nanocrystals was carried out and the effects of the doping concentration of Li+ and Eu3+ active center concentration as well as calcination temperature on the PL properties have been studied in details. The results show that the incorporation of Li+ ions into the YPO4:Eu3+ lattice could induce a remarkable improvement of the PL intensity. The highest emission intensity was observed with the compound of 5%Li+ and 5%Eu3+ co-doped YPO4, whose brightness was increased by a factor of more than 2.5 in comparison with that of the YPO4:5%Eu. (C) 2010 Elsevier B.V. All rights reserved.
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