| Luminescent properties of red phosphors K2Ba（MoO4）2：Eu3＋ for white light emitting diodes |
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| 作者姓名： | LI Zhaomei ZHONG Yingjuan GAOShaokang |
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| 作者单位： | College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, China |
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| 基金项目： | Foundation item： Project supported by Natural Science Foundation of Fujian Province （2011J033） |
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| 摘 要： | K2Ba(MoO4)2:Eu3+ phosphors were synthesized by solid-state reaction. The emission and excitation spectra of K2 Ba(MoO4)2:Eu3+ phosphors exhibited that the phosphors could be effectively excited by near ultraviolet (394 nm) and blue (465 nm) light, and emitted red light at 616 nm. The influence of Eu3+concentration, sintering temperature and charge compensators (K+, Na+ or Li+ ) on the emission intensity were investigated. The results indicated that concentration quenching of Eu3+ was not observed within 30mol.% Eu 3+, 600 oC was a suitable sintering temperature for preparation of K2 Ba(MoO4)2:Eu3+phosphors, and K+ ions gave the best improvement to enhance the emission intensity. The CIE chromaticity coordinates of K2 Ba(MoO4)2:0.05Eu3+phosphor were calculated to be (0.68, 0.32), and color purity was 97.4%.
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| 关 键 词： | K2Ba(MoO4)2:Eu3+ red phosphor luminescence charge compensations rare earths |
| 收稿时间： | 13 February 2012 |
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