亚微米Sr 2 MgSi 2 O 7 ∶Eu 2+ ,Dy 3+ 的水热共沉淀制备及发光性能研究

Long-lasting phosphors Sr2MgSi2O7:Eu2+,Dy3+ were synthesized via hydrothermalprecipitation route.X-ray diffraction(XRD),scanning electron microscopy(SEM),photoluminescence(PL),as well as thermoluimnescence(TL) were utilized to characterize the long-lasting phosphors.XRD analysis indicates the obtained Sr2MgSi2O7:Eu2+,Dy3+ sample annealed at 1000 ℃ for 4 h is tetragonal crystal phase.The crystallinity increases with temperature.The obtained phosphors consist of well dispersed submicron particles with a narrow size distribution of 200～300 nm,and these phosphor particles show blue emission corresponding to 5d-4f(467 nm) of Eu2+ under the excitation of visible light(399 nm).The afterglow time of sample synthesized at 1100 ℃ is longer than those synthesized at 1000 ℃ and 1050 ℃.The thermoluminescence spectra of samples show broad bands centering at 330～340 K,which is suitable for the generation of long-lasting phosphorescence.