Abstract: High phonon energy oxides of WO₃, SiO₂ and B2O3 were introduced into the Er³⁺/Ce³⁺ co-doped tellurite glass (TeO₂-Bi₂O₃-TiO₂) with low phonon energy, respectively. The absorption spectra in the wavelength region of 400–1700 nm, fluorescence spectra of 1.53 μm band, fluorescence lifetimes of Er³⁺ and Raman spectra of the glasses were measured. The spectral parameters of Er³⁺ were calculated with the help of McCumber theory. It is shown that the energy transfer process between Er³⁺ and Ce³⁺ becomes more effectively when introducing the high phonon energy oxide, and the 1.53 μm band fluorescence emission corresponding to Er³⁺:⁴I_13/2→⁴I_15/2 transition enhances accordingly due to the increased population of Er³⁺ in the ⁴I_13/2 level. Meanwhile, the fluorescence width at half magnitude (FWHM) and bandwidth quality factor (σ_e×FWHM) can be improved with the introducing of high phonon energy oxide. The results provide practical significance to obtain the excellent spectroscopic glass host applied for the Er³⁺-doped fiber amplifier (EDFA).

Key words: tellurite glass, Er³⁺/Ce³⁺ co-doping, energy transfer, 1.53 μm band fluorescence