Journal
OPTICAL MATERIALS
Volume 34, Issue 8, Pages 1468-1472Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2012.03.001
Keywords
LiLa(MoO4)(2); Phosphor; Sol-gel; Luminescence
Categories
Funding
- National Natural Science Foundation of China [51162012]
- National 863 Plan Project [2010AA03A408]
- Natural Science Foundation of Jiangxi Province [2010GZW0022]
- Scientific and Technological planning of the education office, Jiangxi Province [GCJ2011-243]
- Education Office, Jiangxi Province [GJJ12327]
- Jiangxi University of Science and Technology [JXXJ11021]
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LiLa(MoO4)(2):Eu3+ (in brief LLM:Eu) phosphors have been prepared by sol-gel method. The properties of the resulting phosphors are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence (PL) spectra and decay curve. The excitation spectra of LLM:Eu phosphors are mainly attributed to O2- -> Mo6+ charge-transfer (CT) band at about 280 nm and some sharp lines of Eu3+ f-f transitions in near-UV and visible regions with two strong peaks at 395 and 465 nm, respectively. The emission spectra were used to probe the local environments of Eu3+ ion in LLM crystal. Under the 395 nm excitation, intense red emission peaked at 616 nm corresponding to D-5(0) -> F-7(2) transition of Eu3+ are observed for 55 at.% LLM:Eu phosphors as the optimal doping concentration. The luminescence indicates that the local symmetry of Eu3+ ion in LLM crystal lattice has no inversion center. The luminescence properties suggest that LLM:Eu phosphor may be regarded as a potential red phosphor candidate for near-UV light emitting diodes (LEDs). (C) 2012 Elsevier B.V. All rights reserved.
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