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As reactant for synthesizing K2TiF6:Mn4+ phosphors, the cross-shaped and cuboid-shaped K2MnF5·H2O powders were prepared by the simple chemical method. Based on the reaction mechanism, oxidizing K2MnF5·H2O (Mn3+) to Mn4+ by KMnO4 (Mn7+), a modified cation exchange approach for synthesizing highly efficient red emitting K2TiF6:Mn4+ phosphor was proposed. The obtained K2TiF6:Mn4+ (2.7–5.3 at.%) phosphors...
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