Structures and self-activating photoluminescent properties of Sr{sub 3-x}A{sub x}GaO{sub 4}F (A=Ba, Ca) materials

Journal Article · Mon Oct 15 04:00:00 EDT 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2012.06.001· OSTI ID:22149873

Green, Robert ^[1]; Vogt, Thomas ^[1]

---

1. Nanocenter and Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208 (United States)

The synthesis, structures and photoluminescent properties of mixed oxyfluorides of the type Sr{sub 3-x}A{sub x}GaO{sub 4}F are compared to Sr{sub 3-x}A{sub x}AlO{sub 4}F (A=Ca, Ba) materials. In these compounds the F{sup -} and O{sup 2-} ions are ordered and located on two distinct crystallographic sites. When substituting Sr{sup 2+} by Ba{sup 2+} and Ca{sup 2+}, we find in Sr{sub 3-x}A{sub x}GaO{sub 4}F materials an ordering of the alkaline earth cations over the two crystallographic sites. The amount of Ba{sup 2+} ions that can be substituted into Sr{sub 3-x}A{sub x}GaO{sub 4}F is x{<=}1.2, which is slightly more than can be incorporated into the previously reported Al-analog Sr{sub 3-x}A{sub x}AlO{sub 4}F (x=1.0). Conversely, the amount of Ca{sup 2+} ions that can be substituted into Sr{sub 3-x}Ca{sub x}GaO{sub 4}F (x=0.3) is significantly less than in Sr{sub 3-x}Ca{sub x}AlO{sub 4}F (x=1.0). A post-synthesis reduction step causes these materials to exhibit self-activating broad band photoluminescence where the emitted colors vary with the amount of ions substituted into the host lattice. - Graphical abstract: TOC Statement The structures of the self-activating phosphors Sr{sub 3-x}A{sub x}MO{sub 4}F (A=Ba, Ca and M=Al, Ga) can be rationalized as alternating layers of bond compression and elongation, which impact the photoluminescence. Highlights: Black-Right-Pointing-Pointer Comparison of the structural changes in Sr{sub 3-x}A{sub x}AlO{sub 4}F and Sr{sub 3-x}A{sub x}GaO{sub 4}F (A=Ba, Ca) and its influence on the photoluminescence of these self-activating phosphors. Black-Right-Pointing-Pointer Analysis of the Global Instability Index of the Sr{sub 3-x}A{sub x}AlO{sub 4}F and Sr{sub 3-x}A{sub x}GaO{sub 4}F (A=Ba, Ca). Black-Right-Pointing-Pointer Comparison of the photoluminescence between the self-activating phosphors Sr{sub 3-x}A{sub x}AlO{sub 4}F and Sr{sub 3-x}A{sub x}GaO{sub 4}F (A=Ba, Ca).

• OSTI ID: 22149873
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 194; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BARIUM IONS
CALCIUM IONS
CRYSTALLOGRAPHY
OXYFLUORIDES
PHOTOLUMINESCENCE
SYNTHESIS