A series of Sr2-xGa2SiO7:xSm3+red phosphors were synthesized using the high-temperature solid-phase method.The synthesized phosphors were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),photoluminescence(PL)spectra,high-temperature luminescence spectra,fluorescence quantum efficien-cy,and fluorescence decay lifetime to investigate their phase composition,crystal structure,luminescent properties,and thermal stability.The results indicate that under 404 nm UV excitation,the Sr2-xGa2SiO7:xSm3+phosphors emit bright red light at 598 nm.The luminescence intensity of Sr2-xGa2SiO7:xSm3+phosphors varies with the concentration of Sm3+ions,exhibiting concentration quenching at x=0.03 due to dipole-dipole interactions.As the temperature in-creases,the phosphors display anomalous thermal quenching behavior,reaching maximum luminescence intensity at 393 K,which is 102.5％of that at room temperature.At 473 K,the luminescence intensity can still maintain 101.3％of that at room temperature.Additionally,the fluorescence quantum efficiency of the optimal sample can reach 72.5％.The research demonstrates that Sr2-xGa2SiO7:xSm3+red phosphors are promising luminescent materials for white light-emitting diodes(WLEDs)due to their high thermal stability and quantum efficiency.
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