Synthesis and luminescence properties of red long-lasting phosphor Y_2O_2S:Eu~(3+), Zn~(2+), Ti~(4+) nanotubes via hydrothermal method

摘要

Red long-lasting phosphor Y_2O_2S:Eu~(3+), Zn~(2+), Ti~(4+) nanotubes were prepared by hydrothermal method. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence and thermolumi-nescence spectra (TL) were used to characterize the long-lasting phosphor. XRD investigation revealed that the product synthesised under 750 ℃ for 6 h was a pure phase of Y_2O_2S. SEM observation showed that the sulfuretted phosphor inherited the tube-like shape from the precursor. Under 325 nm UV excitation, the result indicated the strongest red-emission lines at 627 nm, corresponded to the transition from ~5D_0 to ~7F_2 level of Eu~(3+) ion. Both the afterglow decay curves and TL curves revealed that the phosphor had efficient luminescent and excellent long-lasting properties.