微乳液法合成白光LED NaLu(MO_4)_2:Eu^(3+)/Eu^(3+),Tb^(3+)(M=W,Mo)荧光粉  

Synthesis of White LED Eu^(3+)/Eu^(3+), Tb^(3+) Co-doped NaLu(MO_4)(M=W, Mo) Phosphor via Microemulsion Method

作　　者：白晓菲 姜浩[1] 徐晶[1] 闫景辉[1] 康振辉[2] 连洪洲[3] 

机构地区：[1]长春理工大学化学与环境工程学院,长春130022 [2]苏州大学功能纳米与软物质(材料)研究院,苏州215123 [3]中国科学院长春应用化学研究所稀土资源利用国家重点实验室,长春130022

出　　处：《无机化学学报》2015年第2期222-228,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家重点基础研究发展计划(973计划)项目(No.2012CB82580);国家自然科学基金重点项目(51132006);吉林省科学技术厅科技支撑重点项目(No.20120223)

摘　　要：采用微乳液法制备Na Lu(WO4)2-x(Mo O4)x∶8%Eu3+(x=0,0.5,1.0,1.5,2.0)/y%Eu3+,5%Tb3+(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Eu3+离子掺杂物质的量分数为8%时,Na Lu(WO4)(Mo O4)∶Eu3+发光强度最大。Na Lu(WO4)2-x(Mo O4)x∶8%Eu3+(x=0,0.5,1.0,1.5,2.0)荧光粉在nMo/nW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。Na Lu(WO4)(Mo O4)∶y%Eu3+,5%Tb3+(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。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.

关 键 词：微乳液法 钨钼酸盐 白光LED 能量传递 

分 类 号：O611.4[理学—无机化学] O614.33[理学—化学]