Optical character of Er3+/Yb3+ co-doped P2O5-CaO-Na2O-Al2O3-AgO phosphate glass

► The intensity ratios of the upconversion emissions in the Er3+/Yb3+ co-doped P2O5-CaO-Na2O- Al2O3-AgO phosphate glass can vary with the pump powers. ► Based on steady state rate equations, the phenomenon that the intensity ratios of the upconversion emissions vary with the pump powers is reasonable interpreted. ► This research will be helpful to developing the luminescence materials, like as fluorescence anti-counterfeiting and color display.