Synthesis and photoluminescence properties of Ca₃MgSi₂O₈ with high Eu²⁺ concentration

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Eu²⁺-activated Ca₃MgSi₂O₈ (Ca₃MgSi₂O₈:Eu²⁺) phosphors were successfully synthesized by an amorphous metal complex method using propylene glycol-modified silane (PGMS) and heat-treatment under a reduced atmosphere at 1400 °C. The photoluminescence (PL) of Ca₃MgSi₂O₈:Eu²⁺ was studied as a function of total Eu concentration. Furthermore, Ca₃MgSi₂O₈ with Eu²⁺ concentrations at 1.0–30 % for Ca exhibited a blue-green emission peaking at approximately 480 nm. In contrast, with increasing Eu²⁺ concentration up to 50 % for Ca, the emission peak of Ca₃MgSi₂O₈:Eu²⁺ phosphors exhibited a redshift to 521 nm with green emissions. The redshift of emissions in Ca₃MgSi₂O₈:Eu²⁺ phosphors could be attributed to the strong electrostatic interactions related to the Eu²⁺ ions occupying the peculiar Ca sites.