Synthesis and optical properties of Dy³⁺, Li⁺ doped CaMoO₄ phosphor

【摘要】 A series of CaMoO4 phosphors doped with trivalent dysprosium ions (Dy3+) and lithium (Li+) were prepared by solid state method at 750 °C for 3 h. X-ray diffraction (XRD) confirmed the crystal structure and quality of phosphors. Scanning electron microscopy (SEM) in- dicated that the phosphors presented good crystalline state, and the crystalline grain sizes were about 0.5-3.0 μm. The emission spectra showed that the phosphors had intense emission at 480 (4F9/2→6H15/2), 576 (4F9/2→6H13/2) and 660 nm (4F9/2→6H11/2). Meanwhile, the excited spectra indicated it had intense excitation at 352 (6H15/2→6P7/2), 390 (6H15/2→4M21/2) and 450 nm (6H15/2→4I15/2). As a charge compensator, Li+ ions were incorporated into CaMoO4:Dy3+ phosphors, which enhanced the PL intensities depending on the doping concentration of Li+. The optimal molar fraction of Dy3+ ions in Ca1-xMoO4:xDy3+, 0.05Li+ was 0.05.更多还原

【Abstract】 A series of CaMoO4 phosphors doped with trivalent dysprosium ions (Dy3+) and lithium (Li+) were prepared by solid state method at 750 °C for 3 h. X-ray diffraction (XRD) confirmed the crystal structure and quality of phosphors. Scanning electron microscopy (SEM) in- dicated that the phosphors presented good crystalline state, and the crystalline grain sizes were about 0.5–3.0 μm. The emission spectra showed that the phosphors had intense emission at 480 (4F9/2→6H15/2), 576 (4F9/2→6H13/2) and 660 nm (4F9/2→6H11/2). Meanwhile, the excited spectra indicated it had intense excitation at 352 (6H15/2→6P7/2), 390 (6H15/2→4M21/2) and 450 nm (6H15/2→4I15/2). As a charge compensator, Li+ ions were incorporated into CaMoO4:Dy3+ phosphors, which enhanced the PL intensities depending on the doping concentration of Li+. The optimal molar fraction of Dy3+ ions in Ca1-xMoO4:xDy3+, 0.05Li+ was 0.05.更多还原