Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

Ca₃MgSi₂O₈:Eu²⁺(x = 0.003, 0.005, 0.007, 0.01, 0.03 mol) white phosphors for Light Emitting Diodes(LED) are synthesized with different concentrations of Eu²⁺ ions using a solid state reaction method. The crystal structures, surface and optical properties of the phosphors are investigated using X-Ray Diffraction(XRD), Scanning Electron Microscope(SEM) and photoluminescence(PL). The X-Ray Diffraction results reveals that the crystal structure of the Ca₃MgSi₂O₈:Eu²⁺ is a monoclinic system. The particle size of Ca₃MgSi₂O₈:Eu²⁺ white phosphors is about 1~5 μm, as confirmed by SEM images. The maximum emission spectra of the phosphors are observed at 0.01 mol Eu²⁺ concentration. The decrease in PL intensity in the Ca₃MgSi₂O₈:Eu²⁺ white phosphors with Eu²⁺ concentration is interpreted by concentration quenching. The International Commission on Illumination(CIE) coordinate of 0.01 mol Eu doped Ca₃MgSi₂O₈ is X = 0.2136, Y = 0.3771.