Tm^(3+)/Yb^(3+)共掺氟氧化物碲酸盐玻璃的上转换发光及光学温度传感

Up-conversion Light-emitting and Optical Temperature Sensing for Tm^(3+)/Yb^(3+) Codoped Oxyfluoride Tellurite Glass

采用高温熔融淬火法成功的合成了Tm^(3+)/Yb^(3+)共掺杂的含有不同浓度Tm^(3+)的氟氧化物碲酸盐玻璃.测量了样品的吸收光谱,结果表明Yb^(3+)和Tm^(3+)成功掺入到玻璃基质中.在980nm激发下,样品在801nm(3H4→3H6)发射最强,在476nm(1G4→3H6)和651nm(1G4→3F4)发射较弱;分析了上转换发光强度与Tm^(3+)浓度依赖关系,确定了上转换发光的最佳掺杂浓度为0.1%Tm2O3;探讨Tm^(3+)的上转换发光机理和Tm^(3+)的浓度猝灭机理,结果表明在980nm激发下Tm^(3+)获得的能量主要来自于Yb^(3+)→Tm^(3+)的量传递,Tm^(3+)的浓度猝灭机理为Tm^(3+)-Tm^(3+)之间的交叉弛豫导致的无辐射能量传递,根据能量匹配的原则,给出可能的交叉弛豫通道.此外,在980nm激发以3F2,3和3H4作为热耦合能级研究分析了Tm^(3+)在氟氧化物碲酸盐玻璃中的温度传感性能,结果表明灵敏度随温度的升高而升高,说明Tm^(3+)掺杂的氟氧化物碲酸盐玻璃可以作为光纤传感材料,且在高温灵敏度更佳.

A series of Tm3＋/Yb3＋ co-doped oxyfluoride tellurite glasses with various Tm3＋ concentrations was synthesized via a conventional high temperature solid state method.Absorption spectra showed that Yb3＋ and Tm3＋ were successfully incorporated into the matrix.The sample exhibited strong 801 nm emissions corresponding to 3H4→3H6 transitions,with weak 476 and 651 emission respectively corresponding to the 1G4→H6 and 1G4→3F4 transition.Concentration dependence of up conversion luminescence was analyzed and it was found that the optimal Tm2O3 concentration for achieving maximum upconversion emission intensity was 0.1%.Up conversion luminescence mechanism and concentration quenching were studied by emission spectra.Tm3＋ ions obtained energy mainly comes from the energy transfer from Yb3＋ to Tm3＋.The concentration quenching was attributed to the nonradiative energy transfer through cross relaxation mechanism due to dipole-dipole interaction between Tm3＋.Based on this rule,the possible energy transfer processes can be1 G4 ＋ 3 H6→3H5 ＋ 3 H4,1G4 ＋ 3H6→3 H4 ＋ 3 H5,1G4＋3H6→3F2.3 ＋3F4 and 3H5 ＋3H5→3H6 ＋3F2.Additionally,the optical temperature sensing properties were investigated by using the thermal coupling 3F2.3 and 3 H4 levels of Tm3＋ under near infrared 980 nm excitation.The sample can be used as sensing material and better in high temperature sensitivity.