Eu^(3+),Bi^(3+)共掺杂铌酸镁荧光粉的发光性质  

Photoluminescence Properties of MgNb_2O_6: Eu^(3+),Bi^(3+)Red-emitting Phosphor

作　　者：刘娟[1,2] 周立亚[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004 [2]广西壮族自治区冶金产品质量监督检验站,广西南宁530023

出　　处：《广西师范大学学报（自然科学版）》2013年第4期88-92,共5页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(61066006);广西自然科学基金资助项目(2011GXNSFA018054)

摘　　要：采用固相反应法制备MgNb2O6:Eu3+,Bi3+红色荧光粉,对其晶体结构和发光性质进行X-射线衍射(XRD)、电镜和荧光光谱(PL)表征,同时研究Bi3+对MgNb2O6:Eu3+发光性质的影响。结果表明:在1200°C焙烧后可得到MgNb2O6纯相;Mg1-x Nb2O6:Eu3+x荧光粉可以被395nm紫外光有效激发,以615nm处的发射峰为最强峰,对应于Eu3+的5D0→7F2电偶极跃迁。Bi3+的掺杂能增强MgNb2O6:Eu3+荧光粉在329nm左右激发峰的强度,使得MgNb2O6:Eu3+,Bi3+可被329nm的近紫外光有效激发,是一种在短波紫外(200~350nm)发光二极管(LED)上有潜在应用前景的红色荧光材料。Eu^3＋ and Bi3^＋-codoped MgNb206 red-emitting phosphor was prepared by solid-state reaction. The structure,morphology and photoluminescence properties of the phosphors were characterized by X- ray diffraction,scan electron microscopy and fluorescence spectrophotometer. The effect of the Bi^3＋ on the photoluminescence of the MgNb206. Eu^3＋ phosphor was also studied. X-ray diffraction results showed that the pure phase of MgNb206 could be available calcined at 1 200 ℃. Mg1-xNb206：Eu^2＋ phos- phors could be effectively excited by the 395 nm UV irridiation and emit red light at 615 nm due to the forced electric dipole ^5D0→^7F2 transitions of Eu^3＋,which indicated that Eu^3＋ occupied the non-inversion the symmetry sites in the MgNbzO6 host lattice. The addition of the Bi^3＋ increased the photoluminescence intensity of the excitation spectra at about 329 nm. Therefore,MgNb2O6.Eu^3＋ ,Bi^3＋ might find application to shortwave UV （200-350 nm） light emitting diodes.

关 键 词：发光二极管 荧光粉 固相反应 稀土 能量传递 

分 类 号：O613.5[理学—无机化学]