Synthesis and Characterization of Sr_3MgSi_2O_8:Eu~(2+),Dy~(3+) Phosphor Prepared by a Chemical Solution Method

摘要

A novel synthesis route for the production of Sr_3MgSi_2O_8:Eu~(2+),Dy~(3+) sub-micron quasi-sphere phosphor powder is reported. Both the host and activator cations were co-precipitated in water-ethanol mixed solutions and precipitation was performed with analytical grade ammonium citratetribasic. As the dispersion media, optimum concentration for PEG in the precursor solution is determined to be 0.08 g/mL. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and fluorescence spectrophotometer were employed to characterize the phosphor. The effect of the calcining temperature on the crystalline particle and luminescence properties of Sr_3MgSi_2O_8:Eu~(2+),Dy~(3+) is systematically discussed. Sr_3MgSi_2O_8:Eu~(2+),Dy~(3+) single phased quasi-sphere phosphor was achieved by calcining the as-precipitated precursor at 1100°C. Sr_2SiO_4 was identified as the intermediate phase during the calcination process. Despite the small particle size, the emission intensities were higher by the present method. However, the afterglow characteristic was not better than that prepared by solid-state reaction in the comparable condition.