Enhanced H-3(4)-F-3(4) nonradiative relaxation of Tm3+ through energy transfer to Yb3+ and efficient back transfer in lowly Tm3+ doped Lu1.6Sc0.4O3:Tm3+, Yb3+
Enhanced H-3(4)-F-3(4) nonradiative relaxation of Tm3+ through energy transfer to Yb3+ and efficient back transfer in lowly Tm3+ doped Lu1.6Sc0.4O3:Tm3+, Yb3+
复制标题
通过能量转移至 Yb3 增强 Tm3 的 H-3(4)-F-3(4) 非辐射弛豫以及低 Tm3 掺杂 Lu1.6Sc0.4O3:Tm3 、 Yb3 中的有效反向转移
DOI：
10.1016/j.jallcom.2016.11.126
复制
发表时间：
2016
影响因子：
6.2
通讯作者：
Zhang Jiahua
中科院分区：
文献类型：
--
作者：
Liu Wen;Hao Zhendong;Zhang Liangliang;Zhang Xia;Luo Yongshi;Pan Guohui;Wu Huajun;Zhang Jiahua
Under 808 nm excitation into the Tm3+:3H4level, a considerable enhancement in intensity of Tm3+:3F4→3H6emission with respect to Tm3+:3H4→3F4emission is observed in Tm3+/Yb3+codoped Lu1.6Sc0.4O3. The Tm3+-Yb3+-Tm3+forward-backward energy transfer is proved to generate an additional route for the3H4→3F4nonradiative relaxation, that is, energy transfer from Tm3+:3H4to Yb3+:2F5/2and the subsequent back transfer from Yb3+:2F5/2to Tm3+:3F4. The analysis of emission spectra reveals that back transfer from Yb3+that excited by the forward energy transfer is more efficient than by absorption of 980 nm infrared light. The efficiency can reach as high as 96% with an extremely low Tm3+concentration (0.05%). We propose that those Yb3+ions with nearby Tm3+ions in the forward energy transfer are preferentially excited instead of equally excited as by absorption of light. The efficiencies of the energy back transfer at different Yb3+concentrations are evaluated, indicating that the forward-backward energy transfer can act as a dominant route for the Tm3+:3H4→3F4nonradiative relaxation when Yb3+concentration is higher than 5%. A method to determine the radiative rate of Tm3+:3H4state based on the model of cross relaxation is also demonstrated.
