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Title: Photostability can be significantly modulated by molecular packing in glasses

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:
 [1] ;  [2] ;  [2] ;  [2]
  1. University of Wisconsin-Madison
  2. University of Chicago
Publication Date:
DOE Contract Number:
SC0002161
Product Type:
Dataset
Research Org(s):
University of Wisconsin-Madison
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Resource Relation:
Related Information: Qiu, Y.; Antony, L. W.; de Pablo, J.J.; Ediger, M.D. “Photostability Can Be Significantly Modulated by Molecular Packing in Glasses” J. Am. Chem. Soc. 2016, 138, 11282–11289
Subject:
36 MATERIALS SCIENCE
Related Identifiers:
DOI: 10.1021/jacs.6b06372 [IsMetadataFor] 10.11578/1350776
OSTI Identifier:
1350776

Ediger, Mark, de Pablo, Juan, Anthony, Lucas, and Qiu, Yue. Photostability can be significantly modulated by molecular packing in glasses. United States: N. p., Web. doi:10.11578/1350776.
Ediger, Mark, de Pablo, Juan, Anthony, Lucas, & Qiu, Yue. Photostability can be significantly modulated by molecular packing in glasses. United States. doi:10.11578/1350776.
Ediger, Mark, de Pablo, Juan, Anthony, Lucas, and Qiu, Yue. 2016. "Photostability can be significantly modulated by molecular packing in glasses". United States. doi:10.11578/1350776. https://www.osti.gov/servlets/purl/1350776.
@misc{osti_1350776,
title = {Photostability can be significantly modulated by molecular packing in glasses},
author = {Ediger, Mark and de Pablo, Juan and Anthony, Lucas and Qiu, Yue},
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 = {10.11578/1350776},
year = {2016},
month = {4} }
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