Browsing by Author "Gahrs, CJ"

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    Structure, stability, and photoluminescence in the anti-perovskites Na3W1−xMoxO4F (0≤x≤1)
    (Elsevier, 2015-10-01) Sullivan, E; Avdeev, M; Blom, DA; Gahrs, CJ; Green, RL; Hamaker, CG; Vogt, T
    Single-phase ordered oxyfluorides Na3WO4F, Na3MoO4F and their mixed members Na3W1−xMoxO4F can be prepared via facile solid state reaction of Na2MO4·2H2O (M=W, Mo) and NaF. Phases produced from incongruent melts are metastable, but lower temperatures allow for a facile one-step synthesis. In polycrystalline samples of Na3W1−xMoxO4F, the presence of Mo stabilizes the structure against decomposition to spinel phases. Photoluminescence studies show that upon excitation with λ=254 nm and λ=365 nm, Na3WO4F and Na3MoO4F exhibit broad emission maxima centered around 485 nm. These materials constitute new members of the family of self-activating ordered oxyfluoride phosphors with anti-perovskite structures which are amenable to doping with emitters such as Eu3+. © 2015 Elsevier Inc.