论文部分内容阅读
A flower-like Eu2+ and Dy3+ co-doped SrAl2O4 long-lasting phosphorescent (LLP) phosphor was synthesized via the inorganic- salt-based sol-gel method.The crystal structure,morphology and optical properties of the composite were characterized.X-ray diffraction diffu-sion (XRD) data and DSC-TG curves of the phosphor revealed that the SrAl2O4 crystallites have been formed after the precursor was calcined at 900 °C and to be single-phase SrAl2O4 at 1100 °C.The SEM photographs indicated that the sample exhibited a universal flower-like morphology with crystallite size of about 1–2 μm.After being irradiated with ultraviolet (UV) light,the flower-like phosphor emitted long-lasting green phos-phorescence with an excitation peak at 365 nm and emission peak at 500 nm which was ascribed to the characteristic 5d-4f transition of Eu2+.Both the PL spectra and the luminance decay curve revealed that this phosphor exhibited efficient luminescence and long lasting properties.
A flower-like Eu2 + and Dy3 + co-doped SrAl2O4 long-lasting phosphorescent (LLP) phosphor was synthesized via the inorganic-salt-based sol-gel method. Crystal structure, morphology and optical properties of the composite were. X-ray diffraction diffu-sion (XRD) data and DSC-TG curves of the phosphor revealed that the SrAl2O4 crystallites have been formed after the precursor was calcined at 900 ° C and to be single-phase SrAl2O4 at 1100 ° C. The SEM photographs indicated that the sample exhibits a universal flower-like morphology with a crystallite size of about 1-2 μm. After being irradiated with ultraviolet (UV) light, the flower-like phosphor emitted long-lasting green phos-phorescence with an excitation peak at 365 nm and emission peak at 500 nm which wascribed to the characteristic 5d-4f transition of Eu2 + .Both the PL spectra and the luminance decay curve that that phosphor imposes efficient luminescence and long lasting properties.