Synthesis and Luminescent Properties of Eu2+ Doped Sr5SiO4Cl6 Phosphor by Sol-Gel Method

The paper discusses preparation and luminescent properties of Sr5SiO4Cl6:Eu2+ blue phosphor, which was synthesized by sol-gel method. The emission and excitation spectra, SEM, XRD and diffuse reflection of the fluorescent powder were measured. It was shown that the samples were single phase of Sr5SiO4Cl6 by the XRD patterns. The photoluminescence and excitation spectra of this phosphor were investigated. The phosphor excited by 278 nm light showed an asymmetric spectrum. The emission spectra can be separated into three distinct peaks located at 450, 480 and 540 nm, respectively. The influences of Eu2+ ions concentration on the emission intensity of Sr5SiO4Cl6:Eu2+ phosphors were studied in detail. The influences of different sintering temperature on the emission intensity were also investigated. The optimal sintering temperature was 750 °C. Effects of the amount of complexing agent were studied and a ratio of 1~1.1 to that of the cation was the best. The particle diameter of the phosphor was studied by SEM. The potential applications were also discussed.