Enhancement of luminescence intensity and color purity of Mg_x Zn_(1–x) MoO_4:Eu^(3+),Bi^(3+) phosphors  

作　　者：莫福旺 陈培灿 关安翔 张伟 周立亚 

机构地区：[1]School of Chemistry and Chemical Engineering, Guangxi University

出　　处：《Journal of Rare Earths》2015年第10期1064-1071,共8页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China(61264003);the Science Foundation of Guangxi Province(2015GXNSFAA139025);Innovation Project of Guangxi Graduate Education(YCBZ2014010);the Students Innovation and Entrepreneurship Training Program of Guangxi University(201410593101)

摘　　要：ZDAMoO4：Eu3＋ red phosphors co-doped with Mg2＋ and Bi3＋ were synthesized using a solid-state reaction. X-ray powder diffraction, scanning electron microscopy, and photoluminescence analysis were used for characterizing the phosphors. The introduction of Mg2＋ into a Zn2＋ site further enhanced the emission intensity of the 5D0→VF2 transition since the asymmetry ofa Eu3＋ site increased when Zn2＋ was substituted by Mg2＋. The co-doped Bi3＋ efficiently sensitized the emission of Eu3＋ and effectively extended the absorption of near-ultraviolet light with wavelengths ranging from 300 to 370 nm. The high color purity of Mg0.10Zn0.84MoO4：Eu0.053＋,Bi0.013＋ was calculated to be 91.80%. The thermal quenching temperature Td was about 387 K and the activation energy for thermal quench- ing was found to be about 0.31 eV for Mg0.10Zn0.84MoO4.Eu0.053＋,Bi0.013＋, respectively. Moreover, the results revealed that the energy transfer was more effective when the Zn0.95MoO4：Eu0.053＋ phosphors were co-doped with Mg2＋ ions and Bi3＋ ions than those doped only with Mg2＋ ions.ZDAMoO4：Eu3＋ red phosphors co-doped with Mg2＋ and Bi3＋ were synthesized using a solid-state reaction. X-ray powder diffraction, scanning electron microscopy, and photoluminescence analysis were used for characterizing the phosphors. The introduction of Mg2＋ into a Zn2＋ site further enhanced the emission intensity of the 5D0→VF2 transition since the asymmetry ofa Eu3＋ site increased when Zn2＋ was substituted by Mg2＋. The co-doped Bi3＋ efficiently sensitized the emission of Eu3＋ and effectively extended the absorption of near-ultraviolet light with wavelengths ranging from 300 to 370 nm. The high color purity of Mg0.10Zn0.84MoO4：Eu0.053＋,Bi0.013＋ was calculated to be 91.80%. The thermal quenching temperature Td was about 387 K and the activation energy for thermal quench- ing was found to be about 0.31 eV for Mg0.10Zn0.84MoO4.Eu0.053＋,Bi0.013＋, respectively. Moreover, the results revealed that the energy transfer was more effective when the Zn0.95MoO4：Eu0.053＋ phosphors were co-doped with Mg2＋ ions and Bi3＋ ions than those doped only with Mg2＋ ions.

关 键 词：optical materials LUMINESCENCE X-ray diffraction rare earths 

分 类 号：TQ422[化学工程]