Yb^(3+)/Er^(3+)共掺Gd_2Mo_3O_(12)的强绿色上转换发光及温度传感特性  

Strong Green Upconversion Luminescence and Temperature Sensing Properties of Yb^(3+)/Er^(3+) Co-doped Gd_2Mo_3O_(12) Phosphors

作　　者：简荣华[1] 庞涛[1] Jian Ronghua;Pang Tao(College of science,Huzhou University,Huzhou 313000,China)

机构地区：[1]湖州师范学院理学院,浙江湖州313000

出　　处：《中国稀土学报》2018年第5期533-540,共8页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(11647306);湖州师范学院校级项目(2016XJXM23)资助

摘　　要：采用固相反应法合成了Gd_2Mo_3O_(12):x%Yb^(3+)/1%Er^(3+)(x=0,2,5,10,20)荧光粉。当Yb^(3+)浓度超过5%,Yb^(3+)-MoO_4^(2-)二聚体形成并发挥敏化作用;当Yb^(3+)浓度达20%,二聚体敏化主导上转换发光。由于二聚体敏化抑制红光发射,成功获得高强度的绿色上转换发光。结合反射谱、拉曼谱、下转换谱、上转换功率关系、二聚体模型和三能级模型,详细讨论了这种和Yb^(3+)浓度有关的上转换发光。另外,基于两个绿光发射带的相对强度比,探究了最佳样品在300~500K范围内的温度传感特性,证实Gd_2Mo_3O_(12):Yb^(3+)/Er^(3+)在温度传感方面具有潜在应用价值。The Gd2 Mo3O12：x% Yb3＋/1% Er3 ＋ （x = 0, 2, 5, 10, 20 ） phosphors were synthesized by a solid state method. When the Yb3＋ concentration is larger than 5%, the Yb3＋ -MoO42- dimer is formed and plays a role in the emission process, while the dimer sensitization dominates the u Since the red emission is inhibited by the dimer sensitization, pc th onversion luminescence in the case of 20% Yb3 ＋ e strong green emission is achieved. According to the reflectance, Raman and down-conversion spectra as well as the power dependences of upconversion emissions, Yb3＋ -MoO42- dimer model and three-level model, the Yb3＋ concentration dependent upconversion luminescence is discussed in detail. In addition, based on the relative intensity ratio of the two green upconversion emission bands, the upconverting temperature sensing properties of the optimum sample in the range of 300 - 500 K is investigated. As a result, it is confirmed that the Gd2Mo3O12 ：Yb3＋/Er3＋ has potential application in the optical thermometry.

关 键 词：上转换 温度传感 Yb3+敏化 Yb3+-MoO24-二聚体 

分 类 号：O433.4[机械工程—光学工程]