中文摘要：

采用共沉淀法制备了不同Eu3＋掺杂浓度的Gd2W2O9和Gd2（WO4）3纳米发光材料.通过对纳米材料样品的X射线衍射谱（XRD）和场发射扫描电镜（FE-SEM）照片的观察和分析,对样品的结构和形貌进行了表征.测量了各样品的发射光谱、激发光谱,计算了各样品的部分J-O参数和Eu^3＋5D0能级量子效率,绘制了不同基质中Eu3＋发光的浓度猝灭曲线,对Eu^3＋掺杂的Gd2W2O9和Gd2（WO4）3纳米发光材料的光致发光性质进行了研究.实验结果证明,与较常见的Gd2（WO4）3：Eu一样,Gd2W2O9：Eu中Eu^3＋5D0→7F2跃迁的红色发光也能被395nm和465nm激发光有效激发,具有近紫外（蓝光）相对激发效率高,猝灭浓度大的优点,有潜力成为高效的近紫外（蓝光）激发白光LED用红色荧光粉材料.

英文摘要：

Eu^3＋ doped Gd2W2O9 and Gd2 （ WO4 ）3 nanophosphors with different concentrations were prepared via a co-precipitation method. The structure and morphology of the nanocrystal samples were characterized by using X-ray diffraction （XRD） and field emission scanning electron microscopy （ FE-SEM）. The emission spectra and excitation spectra of the samples were measured,the J-O parameters and the quantum efficiencies of the 5D0 level of Eu^3＋ of the samples were calculated,and the concentration quenching curves of Eu^3＋ luminescence in different hosts were given. The study results indicate that similar to the Gd2（WO4）3：Eu,the red emission of Eu^3＋ 5D0→ 7F2 transition in Gd2W2O9：Eu can also be effectively excited by 395 nm near-UV light and 465 nm blue light. So the Gd2W2O9：Eu red phosphors may have a potential application for white light emitting diodes.