中文摘要：

采用微乳液法制备NaLu（WO4）2-x（MoO4）x∶8％Eu^3＋（x=0,0.5,1.0,1.5,2.0）/y％Eu^3＋,5％Tb^3＋（y=1,3,5,7,9）系列荧光粉.通过X射线衍射（XRD）表征,所制样品的X射线衍射峰与标准卡片PDF#27-0729基本吻合,表明所制的样品为白钨矿结构,属于四方晶系.扫描电镜（SEM）显示制备的纳米粒子是梭子状的,粒径大约是110 nm.激发发射光谱显示,在Eu^3＋离子掺杂物质的量分数为8％时,NaLu（WO4）（MoO4）∶Eu^3＋发光强度最大.NaLu（WO4）2-x（MoO4）x∶8％Eu^3＋（x=0,0.5,1.0,1.5,2.0）荧光粉在nMo/n比达到1∶1（x=1）时发光强度最大,强烈的红光发射表明该材料可用于白光LED材料.该荧光粉在268、394和466 nm波长光激发下分别发出橙红色、黄色和淡黄色光,可以满足不同光色需要.NaLu（WO4）（MoO4）：y％Eu^3＋,5％Tb^3＋（y=1,3,5,7,9）荧光粉,随着y值增大,从绿光区（x=0.278,y=0.514）进入白光区（x=0.356,y=0.373）,（x=0.278,y=0.313）,同时观察到Tb3＋到Eu3＋有效能量传递.

英文摘要：

8%Eu^3＋/y%Eu^3＋,5%Tb^3＋（y=1, 3, 5, 7, 9）codoped NaLu（WO4）2-x（MoOa）x （x=0, 0.5, 1.0, 1.5, 2.0） phosphor were prepared via microemulsion method at room temperature. X-ray diffraction （XRD）, scanning electron microscopy （SEM） and fluorescence spectroscopy were used to characterize the samples. The XRD of as-prepared samples were in agreement with the PDF#27-0729, showing that sample was the scheelite structure, belongs to the tetragonal crystal system. SEM images showed that the as-prepared particles were shuttle. Particle size was about 110 nm. The critical activator molar concentration （Eu^3＋） in NaLu（WO4）（MoO4）：Eu^3＋ was 8%. As the Mo content increased, the intensity of emission of Eu^3＋ activated at wavelength of 394 nm and 466 nm increased and reached a maximum when the relative ratio of nMo/nw was 1：1. The intense red-emission of the tungstomolybdate phosphors at near-UV and blue excitation suggested that the material was a potential candidate for white light emitting diode （WLEDs）. This phosphor excited by 268, 394 and 466 nm, exhibited orange-red, yellow and pale yellow respectively, meeting the needs of the different light color. In the systems of NaLu（WO4）（MoO4）：y%Eu^3＋,5%Tb3＋（y=1, 3, 5, 7, 9） phosphors, with the increase of the doped concentration of Eu^3＋（y）, the emission color of the co-doped NaLu（WO4）（MoO4） phosphors can be tuned precisely from green （x=0.278, y=0.514）to white （x=0.356, y=0.373）, （x=0.385, y=0.313）. At the same time, a very efficient energy-transfer from Tb^3＋ to Eu^3＋can be observed.