Wan, Rui; Wang, Pengfei; Li, Shengwu; Ma, Yuan

Tellurite oxyfluoride glasses with composition of 71TeO(2)-10ZnO-10BaF(2)-4K(2)O-3Nb(2)O(5)-2TiO(2) doped with different concentrations of DyF3 (0.3, 0.4, 0.5, 0.7, 1 wt%) were prepared by melt-quenching method under dry O-2 atmosphere. Under 808 nm laser pumping, infrared (IR) fluorescence emission with central wavelength of 2.86 mu m was detected. Basing on the Judd-Ofelt (J-O) theory, the intensity parameters (Omega(lambda), lambda=2, 4 and 6) and radiative property were calculated and characterized through the transmission and fluorescence spectra. The tellurite oxyfluoride glass had high thermal stability and large emission cross-section at 2.86 mu m (7.82 x 10(-21) cm(2)). DyF3 doped tellurite oxyfluoride glass ceramic were prepared via in-situ crystallization of ZnTe nanocrystals through heat treatment to ameliorate the surrounding environment of rare earth (RE) ions. The tellurite oxyfluoride glass ceramic prepared by heat treatment at 390 degrees C had great enhancement in 2.86 mu m fluorescence intensity (about 7 times), longer fluorescence lifetime (126 mu s), indicating that the in-situ crystallization method may be helpful for exploring tellurite based high gain laser glass.

The result was published on JOURNAL OF NON-CRYSTALLINE SOLIDS.   DOI: 10.1016/j.jnoncrysol.2021.120842