Luminescence Properties of Cr³⁺ Doped LiGa₅O₈ Prepared by Solid-State Synthesis

Abstract—In this paper, a long afterglow phosphor of LiGa₅O₈:Cr³⁺ was successfully synthesized by high-temperature solid-phase method. The phase composition, microscopic morphology and luminescence characteristics of phosphors are analyzed by X-ray diffraction scanning electron microscopy, transmission electron microscopy, fluorescence spectroscopy, Decay curves, and thermoluminescence curves. And discussed the kinetic series of LiGa₅O₈:Cr³⁺. Compared with phosphors with different Cr³⁺ doping concentrations, when the Cr³⁺ doping concentration is 0.5%, the sample has fewer impurity phases, high crystallinity, regular grain shapes, and a size of about 6 μm. Fluorescence spectra show that the main excitation peaks are 398, 602 nm, and the main emission peak is 719 nm. Thermoluminescence spectra shows that the sample with 0.5% doping concentration has more effective traps and can store more that can produce long-lasting luminescence carriers, the kinetic order is 2 at this time.