【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。更多还原

【Abstract】 8%Eu3+/y%Eu3+,5%Tb3+(y=1, 3, 5, 7, 9)codoped Na Lu(WO4)2-x(Mo O4)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(Eu3+) in Na Lu(WO4)(Mo O4)∶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/ nWwas 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 paleyellow respectively, meeting the needs of the different light color. In the systems of Na Lu(WO4)(Mo O4)∶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 Na Lu(WO4)(Mo O4) 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.更多还原