Up-conversion luminescence properties of Ho3+-Yb3+ Co-doped transparent glass ceramics containing Y2Ti2O7

Abstract

Ho3+-Yb3+ co-doped transparent glass ceramics (GCs) containing Y2Ti2O7 crystal phase were prepared by the melting crystallization method. The structure and morphology of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The combination of the XRD and SEM results showed that Y2Ti2O7 crystals precipitated in the glass matrix, and the optimal heat treatment condition of GCs was determined to be 730℃/2 h by XRD, SEM, differential scanning calorimetry (DSC) and transmittance curves. Under 980 nm excitation, when the doping concentration of Ho2O3 is 0.3%, the emission intensity is the strongest at 543 nm due to the 5F4/5S2→5I8 transition of Ho3+. The energy transfer from Yb3+ to Ho3+ can be observed through the fluorescence spectra of Ho3+-Yb3+ co-doped GCs. The optimal doping concentrations of Ho2O3 and Yb2O3 are 0.3% and 0.6%, respectively. Ho3+-Yb3+ co-doped transparent GCs containing Y2Ti2O7 crystal phase have potential applications in green up-conversion luminescence.