Eu3+掺杂Gd2W2O9和Gd2(WO4)3纳米荧光粉发光性质研究

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Eu3+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Eu3+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Eu3+5D0→7F2跃迁的红色发光也能被395 nm和465 nm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.%Eu3+ doped Gd2W2O9 and Gd2 ( WO4 )3 nanophosphors with different concentrations were prepared via a coprecipitation 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 Eu3+ of the samples were calculated, and the concentration quenching curves of Eu3+ luminescence in different hosts were given. The study results indicate that similar to the Gd2 (WO4)3:Eu, the red emission of Eu3+ 5D0→ 7F2 transition in Gd2 W2O9 :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.