中文摘要：

利用溶胶-凝胶技术制备Eu^3＋、V共掺杂的SiO2材料，通过差热-热重分析、傅立叶红外光谱、X射线衍射、激发光谱与发射光谱等测试手段对粉末的晶型、结构、发光性质进行研究．结果表明：材料属于非晶态，800℃退火后Eu^3＋、V共掺杂的SiO2样品的结构基本稳定，只存在SiO2的网状结构；激发光谱显示，Eu-O电荷迁移带随着V掺杂量的增加而消失，产生强度较大的320nm处的7^F0→5^H3跃迁；发射光谱显示．随着V的掺人，最佳激发波长由393nm向320nm转移，同时出现了467nm，577nm，588nm，612nm处的发射峰，它们分别归属于Eu^3＋的5^D2→7^F0跃迁与VO4^3-的蓝色发射的叠加跃迁、Eu^3＋的5^D0→7^F0跃迁、5^D0→7^F1磁偶极跃迁和5^D0→7^F2的电偶极跃迁，实现了同一物质同时产生蓝色荧光和红色荧光．同时发现，VO4^3-对Eu^3＋的发光有较好的敏化作用，并通过所得的能级图对样品的跃迁机理进行了分析．

英文摘要：

In this paper, the Eu^3＋, V co-doped SiO2 materials are prepared by sol-gel method. DTA-TG, IR and XRD, excitation and emission spectrum are used to characterize the crystal form, structure and luminescence properties of materials. The results indicate that the materials are in amorphous phase and the Si-O-Si network structure is stable after anneal at 800 ℃. The results of excitation spectra indicate that the charge-transfer band of Eu-O is disappear with the increasing of quantity of V, and the strong transition of 7^F0→5^H3 of europium at 320 nm. The emission spectra indicate that with the increasing of V ion,the best excitation wavelength changes from 393 nm to 320 nm. Stimulatingly, the appearance of the bands at 467,577,588 nm and 612 nm belong to superimpose transition of 5^D2→7^F0 of Eu^3＋ and blue transition of VO4^3-, ion,5^D0→7^F0 transition of Eu^3＋ ,magnetic dipole 5^D0→7^F1 transition and electric dipole 5^D0→7^ F2 transition of europium ion,respectively. Therefore,both blue and red light are obtained with this material. The research also show that VO4^3- sensitize the luminescence intensity of europium ion remarkably. At last, the transition mechanism of sample is analyzed by the figure of the energy levels of Eu^3＋ and V co-doped SiO2 material.