Abstract
Currently, Mn4+-activated phosphors have attracted extensive attention for their versatile applications in general lighting, display and plant cultivation. Owing to 3d3 electronic configuration of Mn4+ ion, modifying its local coordination environment emerges as a potent method to tailor its luminescence behavior. Herein, a heterovalent substitution strategy is reported to greatly enhance the photoluminescence (PL) of Ba2CaWO6:Mn4+. The effects of the substitution of rare-earth ions (Ln3+ = Lu3+, Y3+, Gd3+, La3+) for Ca2+ ions on the PL properties of the phosphor are studied in detail. The PL spectral change of Mn4+ induced by Ln3+ substitution is clarified in terms of the local structure of [WO6] octahedron and the valence state of Mn. By selection of Ln3+ ions and optimization of Ln3+ doping concentration, the emission intensity of Ba2Ca0.85Gd0.15WO6:0.25Mn4+ phosphor reaches up to 46.3 times as that of Ba2CaWO6:0.25Mn4+. Besides, the Ba2Ca0.85Gd0.15WO6:0.25Mn4+ phosphor exhibits an internal quantum yield of 56.9 % and a thermal stability of 72.6 %@423 K. Finally, Ba2Ca0.85Ln0.15WO6:Mn4+ based phosphor conversion LED devices are demonstrated, which can be potentially employed for indoor plant lighting.
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