A Novel Synthesis of Alkaline Earth Silicate Phosphor Sr₃MgSi₂O₈:Eu²⁺,Dy³⁺

Abstract

Abstract A novel method for synthesizing long afterglow silicate phosphor Sr 3 MgSi 2 O 8 :Eu 2+ ,Dy 3+ using TEOS and inorganic powders as reactants was reported. Acetic acid as a catalyzer controlled the hydrolysis of TEOS by adjusting pH value of the system. The morphologies of precursor were characterized by transmission electron microscope (TEM). The structure and optical properties of the phosphor powders were systematically investigated by means of X‐ray diffraction and spectrofluorometry. TEM images have reflected the core‐shell structure and quasi‐spherical morphology of the precursor particles. It was found that the single‐phase Sr 3 MgSi 2 O 8 crystalline structures were obtained at 1050 and 1250 °C for the samples prepared with the nano‐coating method and the solid state reaction, respectively. The emission intensities of the phosphors prepared by the present method were higher than those by the conventional process. Also, the afterglow characteristic was better than that prepared by solid‐state reaction in the comparable condition.