Synthesis of Sr₃SiO₅:Eu²⁺ Yellow-orange Phosphor by Gelation Method Using Propylene Glycol-Modified Silane

Abstract

We investigated the synthesis of Sr₃SiO₅:Eu²⁺(SSE) yellow-orange phosphors by three different gelation methods using Propylene Glycol-Modified Silane (①Gelation with Sr, Eu nitrate solution, ②Gelation with Sr, Eu citrate solution, ③Gelation with SrCO₃ and Eu₂O₃ slurry) and the effects of the synthetic methods on the main phase (Sr₃SiO₅) purity and quantum efficiency of SSE phosphors. SSE phosphor synthesized by the nitrate solution method exhibited relatively low main phase purity and quantum efficiency due to segregation of Sr and Eu that occurred during a drying process of the synthesis. SSE phosphor with higher quantum efficiency was obtained by the citrate solution method, but decomposition of a large amount of citric acid was a problem. Obtaining a pasty white gel by adding PGMS to the slurry of SrCO₃ and Eu₂O₃ without adding citric acid was the best way to obtain SSE phosphor having the highest phase purity and quantum efficiency with constituent elements evenly distributed. The slurry method was also effective from the viewpoint of not requiring decomposition of a large amount of organic components.