SiO_2@ZnWO_4∶Eu^(3+)红色荧光粉的制备及其发光性质研究  

Preparation and Photoluminescence Properties of SiO_2@ZnWO_4:Eu^(3+) Phosphor

作　　者：蒋彩娜[1] 王荣芳[2] 何涛[2] 周立亚[2] 

机构地区：[1]桂林医学院药学院,广西桂林541004 [2]广西大学化学化工学院,广西南宁530004

出　　处：《稀土》2012年第5期87-90,共4页Chinese Rare Earths

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：以正硅酸乙酯为硅源,用水热法制备了SiO2@ZnWO4∶Eu3+荧光粉,对样品分别进行了X射线衍射(XRD)、透射电镜(TEM)、荧光光谱(PL)等表征。XRD结果表明,当水热反应温度为180℃,反应时间12小时,可以得到ZnWO4的纯相。TEM和EDS结果表明,样品中含有Si、Eu、O、Zn、W元素。荧光光谱结果表明,SiO2@Zn-WO4∶Eu3+荧光粉能够被393 nm的紫外光激发,在615 nm处发出红色荧光,且SiO2@ZnWO4∶Eu3+荧光粉的发射光谱中电偶极跃迁5D0→7F2强度大于磁偶极跃迁5D0→7F1的强度,表明Eu3+在其中处于没有对称中心的格位。In this paper,SiO2@ZnWO4：Eu3＋ phosphors have been prepared by hydrothermal reaction method using TEOS as silica source.The samples were characterized by powder x-ray diffraction（XRD）,transmission electron microscopy（TEM） and fluorescence spectroscopy（PL）.The results of XRD show that ZnWO4 pure phase was synthesized after reaction at 180 ℃ for12 hours.TEM and energy dispersive spectrometer（EDS） results show that the samples contain Si,Eu,O,Zn and W elements.The SiO2@ZnWO4：Eu3＋ phosphors can be efficiently excited by an ultraviolet（UV）（393 nm） source,and emitted strong red-emission lines at 615 nm,which were corresponding to the forced electric dipole 5D0→7F2 transitions of Eu3＋.The transition 5D0→7F2 is much stronger than the transition 5D0→7F1 which suggests that the Eu3＋ is located in a distorted cation environment.

关 键 词：发光 荧光粉 水热法 

分 类 号：O482.31[理学—固体物理]