中文摘要：

利用固相反应法制备了EuVO4样品,利用X射线衍射,傅里叶红外光谱,激发光谱与发射光谱等测试手段对其粉末的晶型、结构、发光性质进行了研究。XRD结果表明,随着反应温度的升高,V2O5和Eu2O3在600℃左右开始反应,700℃左右反应基本完成,生成物属四方晶系,与EuVO4标准图谱一致,说明固相反应主产物是EuVO4;红外光谱证明,VO键的伸缩振动变弱,并向低波数移动,O—V—O的反对称伸缩振动明显增强;激发光谱的主要变化是Eu—O电荷迁移带随着反应温度的升高而消失,产生出强度很强的323nm处的7F0—5H3跃迁;发射光谱结果表明,随着V2O5和Eu2O3向EuVO4转变,最佳激发波长也由275nm逐渐向323nm移动,同时出现了467,592和616nm处的发射峰。它们分别归属于VO43-的蓝色发射、Eu^3＋的磁偶极跃迁和电偶极跃迁,实现了同一物质同时产生蓝色荧光和红色荧光,而且VO43--对Eu3＋的发光有较好的促进作用。

英文摘要：

The material of EuVO4 was prepared by solid state reaction, and the structure, crystal form and luminescence properties of the material were characterized by X ray diffraction spectrum, infrared spectrum analysis, excitation spectrum and emission spectrum, respectively. XRD was measured at different annealing temperature and the results indicate that V2O5 and Eu2O3 began to react around 600 252, and the reaction almost finished at 700℃ with the component of product being EuVO4. The product is in tetragonal crystallographic structure, consistent with crystal EuVO4. So the high purity of EuVO4 was obtained and was stable at high temperature and in chemistry environment. The IR analysis shows that the V=O bond stretching vibration became weaker,and moved towards low wavelength. However, the O--V--O bond of asymmetrical stretching vibration increased remarkably. We also found that the product transferred to EuVO4 after annealed at 700℃. In excitation spectrum （the monitoring wavelength is 617 urn）, the Eu--O charge transportation band disappeared with increasing temperature, and the strong band at 323 um is corresponding to 7F0-5H3 transition of europium ion. And the other bands at 361, 382, 395,417 and 465 um are corresponding to 7F0--5D4, 7F0--5L7, 7F0--5L6, 7F0--5D3 and 7F0--5D2 transition of europium ion respectively. The excitation spectra at different annealing temperature approved the formation temperature of EuVO4 again. The emission spectra were excited at 275 urn, indicating that with the inversion of V2O5 and Eu2O3 to EuVO4, the excitation wavelength changed from 275 to 323 nm. Stimulatingly, the appearance of the bands at 467, 592 and 616 nm was corresponding to blue transition of VO43- ion, magnetic dipole transition 5D0--7F1 and electric dipole transition 5D--07F2 of europium ion at 592 and 616 urn, respectively. The authors obtained the material with both blue light and red light. And we found that VO43- sensitized the luminescence intensity of europium ion remarkably.