| 微乳液法合成白光LED NaLu(MO4)2:Eu3+/Eu3+,Tb3+(M=W, Mo)荧光粉 | |
| Synthesis of White LED Eu3+/Eu3+, Tb3+ Co-doped NaLu(MO4)(M=W, Mo) Phosphor via Microemulsion Method | |
| 摘要: 采用微乳液法制备NaLu(WO4)2-x(MoO4)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110nm.激发发射光谱显示,在Eu3+离子掺杂物质的量分数为8%时,NaLu(WO4)(MoO4):Eu3+发光强度最大.NaLu(WO4)2-x(MoO4)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466nm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%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. | |
| 关键词: 微乳液法 钨钼酸盐 白光LED 能量传递 | |
| 基金项目: 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)和吉林省科学技术厅科技支撑重点项目(No.20120223). | |
| Abstract: 8%Eu3+/y%Eu3+,5%Tb3+(y=1, 3, 5, 7, 9)codoped NaLu(WO4)2-x(MoO4)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 XRDof as-prepared samples were in agreement with the PDF#27-0729, showing that sample was the scheelite structure, belongs to the tetragonal crystal system. SEMimages showed that the as-prepared particles were shuttle. Particle size was about 110 nm. The critical activator molar concentration (Eu3+) in NaLu(WO4)(MoO4):Eu3+ was 8%. As the Mo content increased, the intensity of emission of Eu3+ 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-UVand 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%Eu3+,5%Tb3+(y=1, 3, 5, 7, 9) phosphors, with the increase of the doped concentration of Eu3+(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 Tb3+ to Eu3+ can be observed. | |
| Keywords: microemulsion tungstomolybdate WLED energy-transfer | |
| 投稿时间：2014-07-18 修订日期：2014-09-21 | |
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| 白晓菲,姜浩,徐晶,闫景辉,康振辉,连洪洲.微乳液法合成白光LED NaLu(MO4)2:Eu3+/Eu3+,Tb3+(M=W, Mo)荧光粉[J].无机化学学报,2015,31(2):222-228. | |
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