Optical transition properties, energy transfer upconversion luminescence, and temperature-sensing characteristics of Tm3+/Yb3+ Co-doped oxyfluoride tellurite glass

The optical transition properties of Tm3+ in oxyfluoride tellurite glass were determined by the Judd-Ofelt theory. The radiative transition rates, fluorescence branching ratios, and intrinsic lifetime for interesting transitions or level were obtained. The optimum doping concentration of Tm3+ for sample was examined, and the optimal concentration for upconversion luminescence was 0.1% Tm2O3. The main reason for concentration quenching was nonradiative energy transfer through the cross-relaxation mechanism. In addition, two-photon processes for near-infrared H-3(4)-> H-3(6) emission and three-photon processes for blue (1)G(4)-> H-3(6) emission of Tm3+ were confirmed by analyzing the dependence of upconversion intensities on the 980 nm fiber laser. The temperature-sensing properties of Tm3+ in oxyfluoride tellurite glass were investigated using F-3(2,3)-> H-3(6) (698 nm) and H-3(4)-> H-3(6) (801 nm) excited at 980 nm, and the F-3(2,3) and H-3(4) states of Tm3+ were thermally coupled levels.

Automated summary

The optical transition properties of Tm3+ in oxyfluoride tellurite glass were determined using the Judd-Ofelt theory. The study obtained radiative transition rates, fluorescence branching ratios, and intrinsic lifetimes for interesting transitions or levels. It was found that the optimal doping concentration for upconversion luminescence was 0.1% Tm2O3. The analysis also confirmed two-photon and three-photon processes for specific emissions of Tm3+.