Alkali Metal Hexafluorido Plumbates(IV) A2[PbF6] (A=Na−Cs) and Luminescence of the Mn4+‐substituted Compounds A2[PbF6] : Mn (A=Li−Cs) and Li2[MF6] : Mn (M=Ti, Ge, Sn)

Abstract We synthesized eight novel red‐emitting Mn 4+ ‐substituted phosphors of the compositions A 2 [PbF 6 ] : Mn ( A =Li−Cs) and Li 2 [ M F 6 ] : Mn ( M =Ti, Ge, Sn) using a dry‐chemical fluorination process which completely avoids the usage of hydrofluoric acid. Compared with the commonly used red‐emitter K 2 [SiF 6 ] : Mn (KSF) the two synthesized phosphors Na 2 [PbF 6 ] : Mn and Li 2 [GeF 6 ] : Mn show a blue‐shift of their emission maximum, Na 2 [PbF 6 ] : Mn even by 4.2 nm. The compounds were characterized by powder X‐ray diffraction, IR and emission spectroscopy. Additionally, we present the crystal structures of the unsubstituted compounds A 2 [PbF 6 ] ( A =Na−Cs). Na 2 [PbF 6 ] crystallizes in the trirutile structure type, whereas the other three are isotypic to K 2 [GeF 6 ] (space group P ).