中文摘要：

采用高温固相法合成具有余辉性能的发光材料Na La0.7（Mo O4）2-x（WO4）x∶0.3Eu3＋（x=0,0.5,1,1.5,2）。用X射线衍射（XRD）和荧光光谱对样品的晶体结构和发光特性进行表征。测试结果表明,在900℃下烧结8 h所合成的Na La0.7（Mo O4）2-x（WO4）x∶0.3Eu3＋样品为纯相Na La（Mo O4）2,样品可被近紫外光393nm和蓝光462 nm有效激发,其发射主峰位于615 nm处,属于Eu3＋的5D0-7F2跃迁。Na La0.7（Mo O4）2-x-（WO4）x∶0.3Eu3＋的发光强度随着W6＋浓度的增加而增大,当W6＋掺杂量x=1时发光最强,而后随W6＋掺杂浓度的增加出现浓度猝灭现象。通过计算得到样品在393 nm和462 nm激发下的色坐标,当W6＋的掺杂量x=1时,样品的红光色纯度最好。

英文摘要：

NaLa0.7（MoO4）2-x（WO4）x：0.3Eu3＋ afterglow luminescent materials were synthesized by solid state reaction. The crystal structure and luminescence properties of the samples were characterized by means of X-ray diffraction and photoluminescence spectra. The results show that NaLa0.7（MoO4）2-x（WO4）x：0.3Eu3＋ phosphors can be excited efficiently by near-ultraviolet （393 nm） and blue light （462 nm）, and the main emission peak is located at 615 nm due to 5D0-7F2 transition of Eu3＋ ions. X-ray diffraction pantterns （XRD） show that the phosphors calcinated at 900 ℃ for 8 h were pure NaLa（MoO4）2 crystal phase. The luminescent intensity of NaLa0.7（MoO4）2-x（WO4）x：0.3Eu3＋ increases with the increasing of W6＋ content, and reaches the maximum when the doping content of W6＋（x） is 1. The phenomenon of concentration quenching occurs when W6＋ doping concentration is excess. Moreover, the CIE chromaticity （x, y） of NaLa0.7-（MoO4）2-x（WO4）x：0.3Eu3＋ excited by 393 nm and 462 nm lights were analyzed. When the doping concentration of W6＋（x） is 1, the red chromaticity coordinate of the samples is closer to the Commission International de LEclairage （CIE） chromaticity coordinates.