The Er-Yb co-doped boro-tellurite glasses with the chemical composition (40-x-y)TeO2+20H3BO3+15K2CO3+15SrCO3+ +10ZnO+xEr2O3 +yYb2O3 (where x = 1, y = 0, 0.5, 1 and 2 in wt%) have been prepared and their luminescence properties are studied through absorption and luminescence spectral analysis. Judd-Ofelt (JO) intensity parameters are estimated through the optical absorption spectral measurements. Using McCumbar theory the absorption and emission cross-section values for the 4I13/2→4I15/2 (1.531μm) transition have been calculated. The high value of gain coefficient and gain band width indicates that the prepared glasses are promising materials for broadband optical amplifier applications. © 2017, National Institute of Optoelectronics. All rights reserved.