Er3+ single doped BaGd2ZnO5 phosphors with various Er3+ concentrations,Er3+/Yb3+ codoped BaGd2ZnO5 phosphors with various concentrations of Er3+ or Yb3+ were obtained via a traditional high temperature solid state method.Crystal structure of the obtained phosphors was characterized by means of X-Ray Diffraction,and it was confirmed that all products exhibited pure phase as BaGd2ZnO5,and that the doping concentration did not evoke change in crystal structure.The upconversion emission spectra for all samples with different rare earth ion concentrations were measured upon 980 nm excitation under the same experimental conditions.It was observed that the green upconversion intensity was larger than that of the red one in the Er3+ single doped phosphors,the red upconversion intensity was larger than that of the green one in the samples with fixed Yb3+ concentration of 20% and various Er3+ concentrations,moreover,the both green and red upconversion intensities are higher for the samples with fixed Er3+ concentration of 5% and various Yb3+ concentrations.The dependence of upconversion intensity on the laser working current (the different excitation power densities) was analyzed,and the two-photon process was confirmed to be responsible for the green and red emissions.The color coordinates for all the samples were calculated,and it is seen that the doping concentration greatly influenced the color coordinates which can be tuned by the rare earth ion doping concentration.