Abstract
Highly efficient bluish white phosphors based on self-activated luminescent materials are essential part for fabricating white lighting diodes. Transition metals have a wide application in catalyst and photoluminescence aspects especially for molybdenum and tungsten, which multi-metal oxides also promote diverse properties. In this work, a serial of novel structural mixed phases phosphors LiCa3MgV3-XWXO12 (short as LCMV-W-X) combined with vanadate and tungsten oxides are constructed by sol-gel method for the first time. The photoluminescence quantum yield (PLQY) of LCMV-W-0.20 is significantly enhanced to 64.37% related to the decreasing of luminous centers distance and oxygen vacancies. The deeper reason for the significant enhancement in PLQY can be ascribed to the fact that the introduction of tungsten phase leads to the lattice deformation of [VO4] and [WO4] tetrahedron of LCMV-W-X, which increases the interaction of luminescence centers. At the same time, the luminescence characteristics of tungsten oxide make LCMV-W-X fluorescence performance change with the change of tungsten content. Hence, this work enlightens a new method to construct highly efficient phosphors.
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