Synthesis of LiEu_1-xBi_x(MoO₄)₂ red phosphors by sol-gel method and their luminescent properties

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• 作者：Jinglei LEI^a ; Yan YU^a ; Lingjie LI^a ; ^{ljli@cqu.edu.cn} ; Shibao CHENG^a ; Guanyu LI^a ; Nianbing LI^b
• 关键词：red phosphor ; sol-gel method ; LiEu1-xBix(MoO4)2 ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2012
• 期刊代码：7_10020721
• 类别：ms
• 出版时间：April, 2012
• 卷：30
• 期：4
• 页码：330-334
• 文件大小：405 K

摘要

The Bi³⁺ doped molybdate-based red-emitting phosphors, LiEu_1-xBi_x(MoO₄)₂, were successfully synthesized with a sol-gel method. The prepared LiEu_1-xBi_x(MoO₄)₂ phosphors exhibited pure and intense red emission at 613 nm under the excitation of near-UV 394 nm. It was discussed in detail that the influence of the synthesis conditions such as the doping concentration of Bi³⁺, the dose of citric acid, pH of the precursor solution and the sintering temperature on the emission intensity of the phosphors. According to the results, the optimal condition was obtained: the doping concentration of Bi³⁺ was 15 mol.%, molar ratio of citric acid to metal ions was 1.5:1, pH of the precursor solution was 1.0 and the sintering temperature was 800 掳C. The X-ray diffraction (XRD) patterns of the LiEu_0.85Bi_0.15(MoO₄)₂ phosphor prepared under the optimal condition indicated that the phosphor was single phase with tetragonal scheelite structure. The Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of LiEu_0.85Bi_0.15(MoO₄)₂ were (x=0.655, y=0.345), which were closer to the national television standard committee (NTSC) standard values (x=0.670, y=0.330) than that of a commercial red phosphor of Y₂O₂S:Eu³⁺(x=0.630, y=0.350). This LiEu_0.85Bi_0.15(MoO₄)₂ red phosphor is a promising candidate for the fabrication of white light-emitting diode (W-LED) with near-UV chips.