Investigations of Photoluminescence Properties of CaMgSiO:yEu (x = 0.5-1.25, y = 0.015-0.035) Phosphors.

Previously, there were almost no relevant studies on developing the optimal CaMgSiO:yEu phosphor composition for its finest optical properties. This study employs two steps to determine the optimal composition for CaMgSiO:yEu phosphors. First, CaMgSiO:yEu (y = 0.015, 0.020, 0.025, 0.030, 0.035) was used as the primary composition of specimens synthesised in a reducing atmosphere of 95% N + 5% H to investigate the effect of Eu ions on the photoluminescence properties of each variant. The emission intensities of the entire photoluminescence excitation (PLE) and photoluminescence (PL) emission spectra of the CaMgSiO:yEu phosphors initially increased as the concentration of the Eu ions increased, peaking at y = 0.025. The cause of the variations across the entire PLE and PL spectra of all five CaMgSiO:yEu phosphors was investigated. Because the CaMgSiO:0.025Eu phosphor had the highest PLE and PL emission intensities, in the next step, CaMgSiO:0.025Eu (x = 0.5, 0.75, 1.0, 1.25) was used as the primary composition to investigate the effect on the photoluminescence properties when the CaO content varied. We also show that the Ca content has an apparent effect on the photoluminescence properties of CaMgSiO:0.025Eu phosphors, and the optimal phosphor composition is Ca.Mg.SiO:0.025Eu because it has the largest PLE and PL values. X-ray diffraction (XRD) analyses of CaMgSiO:0.025Eu phosphors were performed to identify the factors responsible for this outcome.