中文摘要：

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。

英文摘要：

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.