Cooperative upconversion and Yb3-Er energy transfer in newly developed phosphate glasses were studied in this paper. The cooperative upconversion coefficients of level for different Er concentrations were deduced from the pump intensity-dependent luminescence decay curves. Yb3-Er energy transfer efficiencies for different concentrations codoped with Er (-2 x 1020 ions/cm3) were estimated from the lifetime measurements of 2F5, level of Yb ions. The small cooperative upconversion coefficients and high Yb3-Er energy transfer efficiencies indicate these newly developed Er and 1,3+f3+ doped phosphate glasses are excellent for amplifier and laser applications.
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