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

雷惊雷¹，于艳¹，李凌杰¹，程士宝¹，李冠宇¹，李念兵²

1. College of Chemistry and Chemical Engineering, Chongqing University2. School of Chemistry and Chemical Engineering, Southwest University

摘 要：The Bi3+ doped molybdate-based red-emitting phosphors, LiEu1-xBix（MoO4）2, were successfully synthesized with a sol-gel method. The prepared LiEu1-xBix（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 ?C. The X-ray diffraction （XRD） patterns of the LiEu0.85Bi0.15（MoO4）2 phosphor prepared under the optimal condition indicated that the phosphor was single phase with tetragonal scheelite structure. The Commission Internationale de l’E-clairage （CIE） chromaticity coordinates of LiEu0.85Bi0.15（MoO4）2 were （x=0.655, y=0.345）, which were closer to the national television stan-dard 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 LiEu0.85Bi0.15（MoO4）2 red phosphor is a promising candidate for the fabrication of white light-emitting diode （W-LED） with near-UV chips.

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