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A novel red-emitting K2(Ge,Si)F6:Mn4+ phosphor with uniform morphology was synthesized by co-precipitation method. The pure K2GeF6 phase with P63mc space group other than P3m1 space group was affirmed just by incorporation of Si in K2GeF6 at room temperature according to XRD characterization. SEM images showed lamellar and octahedron grain morphology for K2GeF6:Mn4+ and K2(Ge,Si)F6:Mn4+ phosphors,...
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