Abstract
YbAlO3:Mn4+, YbAlO3:Mn4+, Li+, and YbAlO3:Mn4+, Mg2+ phosphors are synthesized by high temperature solid-state reaction method in air. Their crystal structures and luminescence properties are investigated. Photoluminescence excitation (PLE) spectrum monitored at 677nm contains broad PLE band with three PLE peaks located at ∼318, 395, and 470nm within the range 220–600nm. Emission spectra with excitation 318 and 470nm exhibit three emission band peaks located at ∼645, 677, and 700nm in the range of 610–800nm and their corresponding chromaticity coordinates are about (x=0.6942, y=0.3057). The possible luminous mechanism of Mn4+ ion is analyzed by the simple energy level diagram of Mn4+ ion. The optimum Mn4+-doped concentration in YbAlO3:Mn4+ phosphor is about 0.4mol% and the luminescence lifetime of YbAlO3:0.4%Mn4+ phosphor is ∼0.59ms. Emission intensity of YbAlO3:0.4%Mn4+ phosphor can be enhanced ∼6 times after Mg2+ ion is co-doped and it is ∼2 times when Li+ ion is co-doped. The content in the paper is useful to research new Mn4+-doped luminescence materials and improve luminescence property of other Mn4+-doped phosphors.
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