Tunable emission from green to red in the GdSr 2 AlO 5 :Tb 3+ ,Eu 3+ phosphor via efficient energy transfer.

Herein, a series of GdSr 2 AlO 5 :Tb 3+ ,Eu 3+ 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 5 D 0 → 7 F 1 or 5 D 0 → 7 F 2 transition of Eu 3+ , another strong emission corresponding to 5 D 0 → 7 F 4 was observed. Concentration quenching is not obvious in Tb 3+ or Eu 3+ -doped GdSr 2 AlO 5 because structure isolation and energy transfer (ET) of Gd 3+ → Eu 3+ and Gd 3+ → Tb 3+ were found. Moreover, the energy transfer process from Tb 3+ to Eu 3+ 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 GdSr 2 AlO 5 :Tb 3+ ,Eu 3+ can be tuned from green to red by altering the ratio of Tb 3+ /Eu 3+ . These results indicate that the GdSr 2 AlO 5 :Tb 3+ ,Eu 3+ phosphor is a promising single-component white light-emitting phosphor.