Synthesis and Luminescent Properties of ZnGa2S4:Eu,F and ZnGa2O4:Eu,F

ZnGa2S4:Eu,F and ZnGa2O4:Eu,F were synthesized and characterized by x-ray diffraction and photoluminescence (PL) measurements. ZnGa2S4:Eu,F has a tetragonal structure (sp. gr. \(D_{2{\text{d}}}^{11} = I\bar 42m\)) with a= 5.272 A and c= 10.451 A, and ZnGa2O4:Eu,F has a cubic structure (sp. gr. Fd3m) with a= 8.32 A. The PL spectrum of ZnGa2S4:Eu,F consists of a broad band (FWHM = 1.11 eV) at 565 nm due to the Eu2+ 5D1 → 7F 2 transition, and the spectrum of ZnGa2O4:Eu,F shows four emissions due to the Eu3+5D0 → 7F4 (λmax = 682 nm), 5D0 → 7F2 (λmax = 615 nm), 5D0 → 7F1 (λmax = 595 nm), and 5D0 → 7F0 (λmax = 584 nm) transitions.