Abstract
Blue phosphor Sr2MgSi2O7:Eu, Dy (SMS) has been widely used in the applications of painting, watches, clock displays and emergency signboards due to its long afterglow property, long term chemical and physical stability. In this work, solid state reaction method was used in the synthesis of SMS phosphor. The reductive atmosphere was generated by combustion of the raw materials in a graphite crucible. This approach was less costly as compared to the conventional solid state reaction which uses a mixture of hydrogen and nitrogen gas. The PL measurement shows a blue emission at wavelength of 466 nm when excite the SMS phosphor with Xenon lamp at wavelength of 325nm. This emission was attributed to Eu2+ subshells 4f65d1 to 4f7 transition. In addition, the strongest PL emission was obtained with the excitation source of 428 nm. X-ray diffraction analysis shows that SMS phosphor consist of tetragonal structure of Sr2MgSi2O7 and monoclinic structure α-SrSiO3.
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