Photostability Can Be Significantly Modulated by Molecular Packing in Glasses

Qiu, Yue; Antony, Lucas W.; de Pablo, Juan J.; Ediger, M. D.

doi:10.1021/jacs.6b06372

Title: Photostability Can Be Significantly Modulated by Molecular Packing in Glasses

Abstract

While previous work has demonstrated that molecular packing in organic crystals can strongly influence photochemical stability, efforts to tune photostability in amorphous materials have shown much smaller effects. Here we show that physical vapor deposition can substantially improve the photostability of organic glasses. Disperse Orange 37 (DO37), an azobenzene derivative, is studied as a model system. Photostability is assessed through changes in the density and molecular orientation of glassy thin films during light irradiation. By optimizing the substrate temperature used for deposition, we can increase photostability by a factor of 50 relative to the liquid-cooled glass. Photostability correlates with glass density, with density increases of up to 1.3%. Coarse-grained molecular simulations, which mimic glass preparation and the photoisomerization reaction, also indicate that glasses with higher density have substantially increased photostability. These results provide insights that may assist in the design of organic photovoltaics and light emission devices with longer lifetimes.

Authors:

Qiu, Yue ^[1]; Antony, Lucas W. ^[2]; de Pablo, Juan J. ^[2]; Ediger, M. D. ^[1]

Univ. of Wisconsin, Madison, WI (United States). Dept. of Chemistry
Univ. of Chicago, IL (United States). Institute for Molecular Engineering

Publication Date:: Fri Aug 12 00:00:00 EDT 2016

Research Org.:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1411404

Grant/Contract Number:: SC0002161

Resource Type:: Accepted Manuscript

Journal Name:: Journal of the American Chemical Society

Additional Journal Information:: Journal Volume: 138; Journal Issue: 35; Journal ID: ISSN 0002-7863

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Qiu, Yue, Antony, Lucas W., de Pablo, Juan J., and Ediger, M. D. Photostability Can Be Significantly Modulated by Molecular Packing in Glasses.  United States: N. p., 2016. 
Web.  doi:10.1021/jacs.6b06372.

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                    Qiu, Yue, Antony, Lucas W., de Pablo, Juan J., & Ediger, M. D. Photostability Can Be Significantly Modulated by Molecular Packing in Glasses.  United States.  https://doi.org/10.1021/jacs.6b06372

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                    Qiu, Yue, Antony, Lucas W., de Pablo, Juan J., and Ediger, M. D. Fri .  
"Photostability Can Be Significantly Modulated by Molecular Packing in Glasses".  United States.  https://doi.org/10.1021/jacs.6b06372.  https://www.osti.gov/servlets/purl/1411404.

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@article{osti_1411404,

  title        = {Photostability Can Be Significantly Modulated by Molecular Packing in Glasses},

  author       = {Qiu, Yue and Antony, Lucas W. and de Pablo, Juan J. and Ediger, M. D.},

  abstractNote = {While previous work has demonstrated that molecular packing in organic crystals can strongly influence photochemical stability, efforts to tune photostability in amorphous materials have shown much smaller effects. Here we show that physical vapor deposition can substantially improve the photostability of organic glasses. Disperse Orange 37 (DO37), an azobenzene derivative, is studied as a model system. Photostability is assessed through changes in the density and molecular orientation of glassy thin films during light irradiation. By optimizing the substrate temperature used for deposition, we can increase photostability by a factor of 50 relative to the liquid-cooled glass. Photostability correlates with glass density, with density increases of up to 1.3%. Coarse-grained molecular simulations, which mimic glass preparation and the photoisomerization reaction, also indicate that glasses with higher density have substantially increased photostability. These results provide insights that may assist in the design of organic photovoltaics and light emission devices with longer lifetimes.},

  doi          = {10.1021/jacs.6b06372},

  journal      = {Journal of the American Chemical Society},

  number       = 35,

  volume       = 138,

  place        = {United States},

  year         = {Fri Aug 12 00:00:00 EDT 2016},

  month        = {Fri Aug 12 00:00:00 EDT 2016}

}

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https://doi.org/10.1021/jacs.6b06372

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