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.
出处
《广西师范大学学报（自然科学版）》
CAS
北大核心
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)
关键词
发光二极管
荧光粉
固相反应
稀土
能量传递
light-emitting diode
phosphor
solid-state reaction
rare earths
energy transfer
