Abstract
In this paper, a series of GdOF-based green phosphors doped with Ho3+ and Yb3+ ions was prepared by a simple co-precipitation method. The crystal structures and optical properties were investigated in detail. The intensity of the emission of GdOF:Yb3+,Ho3+ phosphors is enhanced by the effective energy transfer from Yb3+ to Ho3+, and the optimal luminescence is achieved with the Ho3+ doping amount of 0.1 mol% as well as Yb3+ doping amount of 5 mol%. Tunable UC emission of samples is achieved by adjusting the doping concentration of Ho3+ or Yb3+. The purity of the green UC emission is further improved by enhancing the excitation pumping power. In addition, logarithmic functions of green, red and near-infrared radiation intensities were calculated versus logarithmic function of pump power for further study. A possible UC luminescence mechanism between Yb3+ and Ho3+ is discussed based on power-dependent UC luminescence spectrum and decay lifetimes. These results suggest that GdOF:Yb3+,Ho3+ phosphors with bright and high-purity green UC emission have potential applications in the fields of bioimaging, display and illumination.
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