Zhao Su-ling, Hou Yan-bing, Xu Zheng, Pei Xiao-jiang
Institute of Optoelectronics Technology, Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2006 Apr;26(4):597-600.
A series of YLiF4: Er3+ , Tm3+ , Yb3+ samples were synthesized by hydrothermal method. The concentrations of Er+ and Yb3+ were 1 mol% and 1.5 mol%, respectively. Tm3+ concentration changed from 2 to 8 mol%. The absorption of Er3+, Tm3+ and Yb3+ were observed, and the absorption of Tm3+ increased along with the increase in Tm3+ concentration. The color of upconversion luminescence of YLiF4: Er3+, Tm3+ and Yb3+ excited by 980 nm was white when Tm3+ concentration was low. The blue light resulted from the transition of 1G4-->3H6 of Tm3+, the green light from the transition of 4S(3/2)(2H(11/2))-->4I(15/2) of Er3+, and the red light from the transitions 1G4-->3F4 of Tm3+ and 4F(9/2)-->4I(15/2) of Er3+. All the upconversion intensities decreased when Tm3+ concentration increased, but the relative intensity decrease was different due to the interaction between Er3+ and Tm3+.
采用水热法合成了一系列YLiF4:Er3+、Tm3+、Yb3+样品。Er3+和Yb3+的浓度分别为1 mol%和1.5 mol%。Tm3+浓度从2 mol%变化到8 mol%。观察了Er3+、Tm3+和Yb3+的吸收情况，发现Tm3+的吸收随Tm3+浓度的增加而增强。当Tm3+浓度较低时，980 nm激发的YLiF4:Er3+、Tm3+和Yb3+的上转换发光颜色为白色。蓝光由Tm3+的1G4→3H6跃迁产生，绿光由Er3+的4S(3/2)(2H(11/2))→4I(15/2)跃迁产生，红光由Tm3+的1G4→3F4跃迁和Er3+的4F(9/2)→4I(15/2)跃迁产生。当Tm3+浓度增加时，所有上转换强度均降低，但由于Er3+与Tm3+之间的相互作用，相对强度降低情况有所不同。
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