Structural changes and self-activated photoluminescence in reductively annealed Sr{sub 3}AlO{sub 4}F

Green, Robert; Avdeev, Maxim; Vogt, Thomas

doi:10.1016/J.JSSC.2015.04.017

Title: Structural changes and self-activated photoluminescence in reductively annealed Sr{sub 3}AlO{sub 4}F

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Abstract

White light emission of self-activated photoluminescence (PL) in Sr{sub 3}AlO{sub 4}F under 254 nm light is only observed after annealing in a reducing atmosphere of 5%H{sub 2}/95%Ar. High-resolution neutron powder diffraction reveals that the FSr{sub 6} octahedrons and AlO{sub 4} tetrahedrons in this anti-perovskite structure are closer packed in reduced than in air-annealed samples which show no PL. Careful analysis of temperature-dependent neutron powder diffraction data establishes smaller isotropic displacement parameters for Sr(1) and O in Sr{sub 3}AlO{sub 4}F annealed in a reducing atmosphere indicating that the denser packing of the polyhedral sub-units leads to a slightly deeper potential for the Sr(1) and O atoms. Both the air- and reductively-annealed samples have identical thermal expansion within the temperature range between 3 and 350 K. The Debye temperatures were calculated using the atomic displacement parameters and show no significant differences between the air and reductively annealed samples making the Debye temperature a bad proxy for self-activated PL. - Graphical abstract: Annealing Sr{sub 3}AlO{sub 4}F under reducing conditions results in an intense self-activated photoluminescence which is correlated with a denser packing of FSr{sub 6} and AlO{sub 4} polyhedra. - Highlights: • Sr{sub 3}AlO{sub 4}F made in air does not show self-activated photoluminescence.more »« less

Authors:

Green, Robert ^[1]; Avdeev, Maxim ^[2]; Vogt, Thomas ^[2]

Department of Chemistry, Allen University Columbia, Columbia, SC 29204 (United States)
Bragg Institute, Australian Science and Technology Organization, PMB 1, Menai, NSW 2234 (Australia)

Publication Date:: Sat Aug 15 00:00:00 EDT 2015

OSTI Identifier:: 22486714

Resource Type:: Journal Article

Journal Name:: Journal of Solid State Chemistry

Additional Journal Information:: Journal Volume: 228; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINATES; ANNEALING; ARGON; ATOMIC DISPLACEMENTS; DEBYE TEMPERATURE; HYDROGEN; NEUTRON DIFFRACTION; PEROVSKITE; PHOTOLUMINESCENCE; REDUCTION; RESOLUTION; STOWING; STRONTIUM FLUORIDES; TEMPERATURE DEPENDENCE; THERMAL EXPANSION; VISIBLE RADIATION

Citation Formats


                    Green, Robert, Avdeev, Maxim, Vogt, Thomas, and Department of Chemistry & Biochemistry & NanoCenter, University of South Carolina, Columbia, SC 29208. Structural changes and self-activated photoluminescence in reductively annealed Sr{sub 3}AlO{sub 4}F.  United States: N. p., 2015. 
        Web.  doi:10.1016/J.JSSC.2015.04.017.

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                    Green, Robert, Avdeev, Maxim, Vogt, Thomas, & Department of Chemistry & Biochemistry & NanoCenter, University of South Carolina, Columbia, SC 29208. Structural changes and self-activated photoluminescence in reductively annealed Sr{sub 3}AlO{sub 4}F.  United States.  https://doi.org/10.1016/J.JSSC.2015.04.017

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                    Green, Robert, Avdeev, Maxim, Vogt, Thomas, and Department of Chemistry & Biochemistry & NanoCenter, University of South Carolina, Columbia, SC 29208. 2015.  
        "Structural changes and self-activated photoluminescence in reductively annealed Sr{sub 3}AlO{sub 4}F".  United States.  https://doi.org/10.1016/J.JSSC.2015.04.017.

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@article{osti_22486714,

  title        = {Structural changes and self-activated photoluminescence in reductively annealed Sr{sub 3}AlO{sub 4}F},

  author       = {Green, Robert and Avdeev, Maxim and Vogt, Thomas and Department of Chemistry & Biochemistry & NanoCenter, University of South Carolina, Columbia, SC 29208},

  abstractNote = {White light emission of self-activated photoluminescence (PL) in Sr{sub 3}AlO{sub 4}F under 254 nm light is only observed after annealing in a reducing atmosphere of 5%H{sub 2}/95%Ar. High-resolution neutron powder diffraction reveals that the FSr{sub 6} octahedrons and AlO{sub 4} tetrahedrons in this anti-perovskite structure are closer packed in reduced than in air-annealed samples which show no PL. Careful analysis of temperature-dependent neutron powder diffraction data establishes smaller isotropic displacement parameters for Sr(1) and O in Sr{sub 3}AlO{sub 4}F annealed in a reducing atmosphere indicating that the denser packing of the polyhedral sub-units leads to a slightly deeper potential for the Sr(1) and O atoms. Both the air- and reductively-annealed samples have identical thermal expansion within the temperature range between 3 and 350 K. The Debye temperatures were calculated using the atomic displacement parameters and show no significant differences between the air and reductively annealed samples making the Debye temperature a bad proxy for self-activated PL. - Graphical abstract: Annealing Sr{sub 3}AlO{sub 4}F under reducing conditions results in an intense self-activated photoluminescence which is correlated with a denser packing of FSr{sub 6} and AlO{sub 4} polyhedra. - Highlights: • Sr{sub 3}AlO{sub 4}F made in air does not show self-activated photoluminescence. • Only when annealing Sr{sub 3}AlO{sub 4}F in a reducing gas is photoluminescence observed. • FSr{sub 6} and AlO{sub 4} polyhedra in reduced Sr{sub 3}AlO{sub 4}F structure are packed more efficient. • Smaller displacement parameters are found for under-bonded Sr(1) and O sites.},

  doi          = {10.1016/J.JSSC.2015.04.017},

  url          = {https://www.osti.gov/biblio/22486714},
  journal      = {Journal of Solid State Chemistry},

  issn         = {0022-4596},

  number       = ,

  volume       = 228,

  place        = {United States},

  year         = {Sat Aug 15 00:00:00 EDT 2015},

  month        = {Sat Aug 15 00:00:00 EDT 2015}

}

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