Abstract
High-saturated red aluminate phosphors SrMgAl10O17 doped with Mn4+ ions were prepared by solid-state reaction at 1,400 °C. The crystal structure and particle morphology of SrMgAl10O17:Mn4+ phosphors were investigated by X-ray diffraction, scanning electron microscopy and their photoluminescence were studied by the excitation and emission spectra. The excitation spectrum of samples showed two broad absorption bands ranging from 250 to 480 nm, which indicated that SrMgAl10O17:Mn4+ could be effectively excited by both near-ultraviolet light and the commercially available blue light of light-emitting diode chips. Simultaneously, the emission spectrum exhibited two sharp peaks (651 and 662 nm) in the deep-red region. It was found that the quenching concentration of Mn4+ in phosphor was 1.5 mol%. In the end, the effects of doping ions, M (Li+, Na+, K+, Cl−) ions, on the luminescent properties of SrMgAl10O17:Mn4+ were investigated, respectively. The results suggested that all of Li+, Na+, and Cl− could significantly improve the luminescent properties of SrMgAl10O17:Mn4+, and the phosphor SrMgAl10O17:Mn4+, M (M = Li+, Na+, Cl−) was expected to be used as a red phosphor in warm white light emitting diode.
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