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    • College of Letters and Science, University of Wisconsin–Madison
    • Department of Chemistry
    • Ediger Research Group
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    Photostability can be significantly modulated by molecular packing in glasses

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    File(s)
    Figure 1 Ramping of DO37 PVD glasses (6.548Mb)
    Figure 2 Kinetic stability of DO37 glasses (395.3Kb)
    Figure 3 Photostability test of DO37 glasses (787.8Kb)
    Figure 4 Quantification of photostability for DO37 PVD glasses (179.8Kb)
    Figure 5 Simulations for photostability (1.418Mb)
    Figure 6 Energy diagram (52.66Kb)
    Figure S1 Photostability test of DO37 glasses-p polarized light (376.1Kb)
    Figure S2 Initial birefringence of vapor-deposited DO37 (60.95Kb)
    Figure S3 Correlation of photosability with glass density for computer simulations (111.1Kb)
    Figure S4 Photostability of vapor-deposited DO37 at different measurement temperatures (120.6Kb)
    Figure S5 Photostability of liquid-cooled DO37 at different measurement temperatures (101.5Kb)
    example data for ellipsometry (39.18Kb)
    example simulations files for growing vapor-deposited films (41.75Kb)
    example simulation files for isomerization in the vapor-deposited films (1.504Mb)
    Date
    2016-08-12
    Author
    Ediger, Mark
    de Pablo, Juan
    Antony, Lucas
    Qiu, Yue
    Publisher
    Journal of the American Chemical Society
    Metadata
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    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.
    Permanent Link
    http://digital.library.wisc.edu/1793/76351
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    • Ediger Research Group

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