Eu concentration dependence of luminescent properties of Sr1−xEuxGa2S4 phosphors synthesized by polymerized complex sulfurization method

Abstract Sr 1− x Eu x Ga 2 S 4 ( x = 0, 0.05, 0.1, 0.3, 0.5, 0.7, 1) phosphors were synthesized by new synthesis method, polymerized complex sulfurization (PCS) method and usual solid state reaction (SSR) method. The structural and luminescent properties of synthesized phosphors were compared in term of Eu concentration dependence. The lattice constants calculated from XRD patterns were found to obey Vegard’s law for the samples synthesized by the PCS method. Quantum efficiency and luminance from EL elements prepared with the samples synthesized by PCS method were about twice as higher as those of SSR method in high Eu concentration range. These results suggest that uniform distribution of metal ions can be achieved by PCS method.