Efficient 2.7 micron emission from Er3Â +/Pr3Â + codoped oxyfluorotellurite glass

► Er and Er-Pr doped oxyfluorotellurite glasses were prepared and compared. ► The prepared glass possesses a large calculated emission cross section around 2.7 μm. ► Efficiency of the energy transfer process from Er to Pr ions is 85 %. ► Enhanced 2.7 μm emission in Er-Pr codoped tellurite glass was obtained;