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

Photostability Can Be Significantly Modulated by Molecular Packing in Glasses

Journal Article · Fri Aug 12 00:00:00 EDT 2016 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.6b06372· OSTI ID:1411404

Qiu, Yue ^[1]; Antony, Lucas W. ^[2]; de Pablo, Juan J. ^[2]; Ediger, M. D. ^[3]

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

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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0002161

OSTI ID:: 1411404

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 35 Vol. 138; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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