The influence of mixed former effect on the thermal stability,1.53 μm emission and the infrared to visible upconversion emission of the Er3+-doped tellurite glasses are investigated.The inhomogeneous broadening of emission spectrum of Er3+ ion with several network formers (WO3,Nb2O5 and GeO2)is discussed by Raman spectra.The results indicate that for Er3+-doped tellurite glass,besides improving the thermal stability of glasses,introducing the network former with appropriate phonon energy is helpful for the improvement of 1.53 μm emission via decreasing the lifetime of Er3+ ∶4 I11/2 level,and lowering the upconversion luminescence in visible wavelength.The present glasses exhibit a large emission cross section ((9.64—10.96)×10-21 cm2)and broad full width at half maximum (FWHM)(50—67 nm),which make them promising host materials for broadband Er3+-doped fiber.