Structure, stability, and photoluminescence in the anti-perovskites Na{sub 3}W{sub 1−x}Mo{sub x}O{sub 4}F (0≤x≤1)

Journal Article · Thu Oct 15 04:00:00 EDT 2015 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2015.07.018· OSTI ID:22486817

Sullivan, Eirin ^[1]; Avdeev, Maxim ^[2]; Blom, Douglas A. ^[3]; Gahrs, Casey J. ^[1]; Green, Robert L. ^[4]; Hamaker, Christopher G. ^[1]; Vogt, Thomas ^[2]

---

1. Department of Chemistry, Illinois State University, Normal, IL 61790 (United States)
2. Bragg Institute, Australian Science and Technology Organization, Locked Bag 2001, Kirrawee DC, NSW 2234 (Australia)
3. Nanocenter and Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208 (United States)
4. Department of Chemistry, Allen University, Columbia, SC 29204 (United States)

Single-phase ordered oxyfluorides Na{sub 3}WO{sub 4}F, Na{sub 3}MoO{sub 4}F and their mixed members Na{sub 3}W{sub 1−x}Mo{sub x}O{sub 4}F can be prepared via facile solid state reaction of Na{sub 2}MO{sub 4}·2H{sub 2}O (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 Na{sub 3}W{sub 1−x}Mo{sub x}O{sub 4}F, 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, Na{sub 3}WO{sub 4}F and Na{sub 3}MoO{sub 4}F 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 Eu{sup 3+}. - Graphical abstract: Directed synthesis of the ordered oxyfluorides Na{sub 3}W{sub 1−x}Mo{sub x}O{sub 4}F (0≤x≤1) has shown that a complete solid solution is attainable and provides the first example of photoluminescence in these materials. - Highlights: • Na{sub 3}W{sub 1−x}Mo{sub x}O{sub 4}F is a complete solid solution with hexagonal anti-perovskite structure. • The presence of even small amounts of Mo stabilizes the structure against decomposition. • Na{sub 3}W{sub 1−x}Mo{sub x}O{sub 4}F has broad emissions centered ≈485 nm (λ{sub ex}=254 nm and λ{sub ex}=365 nm). • These materials constitute a new family of self-activated oxyfluoride phosphors. • Na{sub 3}W{sub 1−x}Mo{sub x}O{sub 4}F materials are amenable to doping with emitters such as Eu{sup 3+}.

• OSTI ID: 22486817
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 230; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CONCENTRATION RATIO
DECOMPOSITION
EUROPIUM IONS
EXCITATION
MOLYBDENUM FLUORIDES
MONOCRYSTALS
NEUTRON DIFFRACTION
OPTICAL PROPERTIES
OXYFLUORIDES
PHASE STABILITY
PHOSPHORS
PHOTOLUMINESCENCE
POLYCRYSTALS
POWDERS
SODIUM FLUORIDES
SODIUM TUNGSTATES
SOLID SOLUTIONS
SOLIDS
SYNTHESIS
X-RAY DIFFRACTION