发光学报, 2017, 38 (8): 995, 网络出版: 2017-08-30   

Eu3+离子激活荧光粉Ca1.9Eu0.1NaMg2-xZnx(VO4)3(0≤x≤1)的发光性质

Photoluminescence Properties of Eu3+-activated Ca1.9Eu0.1NaMg2-xZnx(VO4)3(0≤x≤1.0) Phosphor
作者单位
硅酸盐建筑材料国家重点实验室 武汉理工大学, 湖北 武汉430070
摘要
采用固相反应法合成了Eu3+离子激活的Ca1.9Eu0.1NaMg2-xZnx(VO4)3(0≤x≤1), 并研究了其发光和热猝灭性能。经粉末X射线衍射确认, 反应产物由目标相和微量杂质相EuVO4构成。在355 nm激发下, 样品中均能同时观察到来自[VO4]3-基团和Eu3+离子的特征发光。研究结果表明: 随着x值的增加, 上述两种发光的强度均先增加后降低; 而它们的最强激发峰位置由347 nm逐渐地红移至356 nm, Stokes位移也逐渐地减小。这种现象应归因于Zn3d轨道和O2p轨道间很强的轨道杂化效应, 这种效应随着x值的增加而逐渐增强。此外, Eu3+离子荧光发射强度最大值对应的x值与自激活荧光的不同。当x=1.0时, 两者的相对强度差别最大。经荧光热猝灭测试确认, 上述现象是由样品中的自激活荧光表现出比Eu3+离子荧光更严重的荧光热猝灭造成的。因而, 在紫外光激发下, 样品发出荧光的颜色具有温度敏感性。
Abstract
Eu3+-activated Ca1.9Eu0.1NaMg2-xZnx(VO4)3 (0≤x≤1) were synthesized by solid-state reaction route, and their photoluminescence and thermal quenching properties were studied. The samples were verified through powder X-ray diffraction, and the target phase was identified with tiny impurity of EuVO4 in the obtained product. Excited by 355 nm, all the samples show the characteristic emissions from [VO4]3- group and Eu3+ ion. With the increment of x value, the intensity of either of the above mentioned emissions increases at first and then decreases, while a red-shifting excitation peak from 347 nm to 356 nm and a decreasing Stokes-shift can be observed. Stronger hybridization effect occurres between the Zn3d orbital and the O2p orbital resulted by the increasing x value which is supposed to be responsible for that phenomena. Furthermore, the x value corresponding to the observed intensity maximum for Eu3+ emission is different from the one for self-activated emission. Their highest difference is observed in the sample of x=1.0. It could be due to an apparently more serious thermal quenching of self-activated emission than that of Eu3+ ion emission. Then, a temperature-sensitive color of the emission is also observed in the samples excited by the near ultraviolet light.

阮威威, 刘志国, 刘成振, 阮健, 韩建军, 赵修建. Eu3+离子激活荧光粉Ca1.9Eu0.1NaMg2-xZnx(VO4)3(0≤x≤1)的发光性质[J]. 发光学报, 2017, 38(8): 995. RUAN Wei-wei, LIU Zhi-guo, LIU Cheng-zhen, RUAN Jian, HAN Jian-jun, ZHAO Xiu-jian. Photoluminescence Properties of Eu3+-activated Ca1.9Eu0.1NaMg2-xZnx(VO4)3(0≤x≤1.0) Phosphor[J]. Chinese Journal of Luminescence, 2017, 38(8): 995.

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