Tunable emission from green to red in the GdSrAlO:Tb,Eu phosphor efficient energy transfer.

Herein, a series of GdSrAlO:Tb,Eu phosphors were successfully synthesized through a high temperature solid-state reaction, and their crystal structures as well as photoluminescence properties were investigated in detail. Compared to the intense emission of D → F or D → F transition of Eu, another strong emission corresponding to D → F was observed. Concentration quenching is not obvious in Tb or Eu-doped GdSrAlO because structure isolation and energy transfer (ET) of Gd → Eu and Gd → Tb were found. Moreover, the energy transfer process from Tb to Eu was verified by the overlap of luminescence spectra and the variation of lifetime. Energy transfer mechanism was determined to be a dipole-dipole interaction, and ET efficiency as well as quantum efficiency were also obtained. Moreover, the emission color of GdSrAlO:Tb,Eu can be tuned from green to red by altering the ratio of Tb/Eu. These results indicate that the GdSrAlO:Tb,Eu phosphor is a promising single-component white light-emitting phosphor.