Inner energy transfer and its influence on luminescence properties of CaGa2O4:Eu3+ reddish emission phosphors

Abstract The photoluminescence properties of Eu 3+ doped CaGa 2 O 4 phosphors prepared by high temperature solid state reaction method were firstly investigated and analyzed for the difference from the electroluminescence and the potential applications into LED. The experimental results indicated that there exist two strong absorption bands at around 394 nm and 463 nm, which are consistent with the output wavelengths of GaN-based LEDs. The predominant transition of Eu 3+ ions originates from the electric dipole transition 5 D 0 – 7 F 2 with the red emission at 617 nm, indicating that Eu 3+ ions occupy the sites without inversion symmetry. The optimum concentration of Eu 3+ -doping was obtained to be 4 mol% and the emission quenching occurred when the content of Eu 3+ increased. The inner energy transfer including radiative and non-radiative energy transfer from the host to Eu 3+ ions was observed.