Synthesis of CaMgSi₂O₆:Eu²⁺ phosphor with the polymerizable complex method and adding Li₂CO₃ flux

Abstract

In this study, blue-color emitting phosphors CaMgSi₂O₆:Eu²⁺ (CMS:Eu²⁺) were synthesized by the polymerizable complex method at 1000 °C in a reducing atmosphere. After the synthesis, the desired CMS crystals were obtained, but a small amount of impurity phases, such as Ca₂MgSi₂O₇ and Ca₃MgSi₂O₈, were contained. By adding lithium carbonate Li₂CO₃ as a flux to the polymerizable complex method and washing with 1 mol dm⁻³ HCl solution, the desired CMS:Eu²⁺ was obtained in a single phase. The maximum luminescence intensity was obtained at a flux concentration of 8 mol % for the composition CaMgSi₂O₆ when the amount of added flux was varied.