Improving upconversion photoluminescence of GdAlO3:Er3+ , Yb3+ Phosphors via Ga3+ , Lu3+ Doping

Abstract

GdAlO3:Er3+ , Yb3+ phosphors doped with Lu3+ , Ga3+ ions were prepared via coprecipitation. The influences of substituting Ga3+ for Al3+ and substituting Lu3+ for Gd3+ on the structure and upconversion photoluminescence (UCPL) of the phosphors were studied. The experimental results show that the crystal textures did not change but the lattice parameters changed slightly via Lu3+ , Ga3+ doping. This results in a decrease in the host phonon energy and a marked improvement in the green emission spectrum at 546nm. Moreover, the amounts of surface CO2, CO32-, and OH- species gradually decreased with Lu3+ , Ga3+ doping. The combined effects led to an improvement in the UCPL efficiency with Ga3+ , Lu3+ doping.