Xiang Guotao, Ma Yan, Liu Wen, Wang Jiapeng, Gu Zhiwei, Jin Ye, Jiang Sha, Luo Xiaobing, Li Li, Zhou Xianju, Luo Yongshi, Zhang Jiahua
Department of Mathematics and Physics, Chongqing University of Posts and Telecommunications , 2 Chongwen Road, Chongqing 400065, China.
State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.
Inorg Chem. 2017 Nov 20;56(22):13955-13961. doi: 10.1021/acs.inorgchem.7b02086. Epub 2017 Nov 2.
The red upconversion (UC) emission of Eu ions in LuO: Yb/Eu powders was successfully enhanced by tridoping Ho ions in the matrix, which is due to the bridging function of Ho ions. The experiment data manifest that, in Yb/Eu/Ho tridoped system, the Ho ions are first populated to the green emitting level F/S through the energy transfer (ET) processes from the excited Yb ions. Subsequently, the Ho ions at F/S level can transfer their energy to the Eu ions at the ground state, resulting in the population of EuD level. With the assistance of the bridging function of Ho ion, this ET process is more efficient than the cooperative sensitization process between Yb ion and Eu ion. Compared with LuO: 5 mol % Yb/1 mol % Eu, the UC intensity of EuD→F transition in LuO: 5 mol % Yb/1 mol % Eu/0.5 mol % Ho is increased by a factor of 8.
通过在基质中三掺杂Ho离子，成功增强了LuO:Yb/Eu粉末中Eu离子的红色上转换（UC）发射，这归因于Ho离子的桥连作用。实验数据表明，在Yb/Eu/Ho三掺杂体系中，Ho离子首先通过来自激发态Yb离子的能量转移（ET）过程被填充到绿色发射能级F/S。随后，处于F/S能级的Ho离子可以将其能量转移到基态的Eu离子上，从而使EuD能级被填充。在Ho离子的桥连作用辅助下，该ET过程比Yb离子和Eu离子之间的协同敏化过程更有效。与LuO:5 mol% Yb/1 mol% Eu相比，LuO:5 mol% Yb/1 mol% Eu/0.5 mol% Ho中EuD→F跃迁的UC强度提高了8倍。
