Abstract
A novel self-activated phosphor Na1−xCsxMg4–4xCa4x(VO4)3 (x=0–0.05) was prepared by a solid-state reaction. The phase structure was verified by Rietveld refinements. Luminescence characteristics such as photoluminescence excitation (PLE) and emission (PL) spectra, decay curves and thermal quenching were measured. The phosphor can be efficiently excited by near UV-light, and exhibits a broad emission, which is close to white color region. The detailed luminescence quantum and thermal stability were investigated on the Cs/Ca substitution for Na/Mg in the NaMg4(VO4)3 lattices. The experiments concluded that the big cation substitution for the smaller one in the lattices enhanced the luminescence efficiency and thermal stability of the self-activated vanadate.
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