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    Enhancing the Photoluminescence Emission of Conjugated MEH-PPV by Light Processing

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    Type
    Article
    Authors
    Botiz, Ioan
    Freyberg, Paul
    Leordean, Cosmin
    Gabudean, Ana-Maria
    Astilean, Simion
    Yang, Arnold Chang-Mou
    Stingelin, Natalie cc
    KAUST Grant Number
    CRG-1-2012-THO-015
    Date
    2014-03-20
    Online Publication Date
    2014-03-20
    Print Publication Date
    2014-04-09
    Permanent link to this record
    http://hdl.handle.net/10754/598197
    
    Metadata
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    Abstract
    We show here that treatment of thin films of conjugated polymers by illumination with light leads to an increase of the intensity of their photoluminescence by up to 42%. The corresponding enhancement of absorbance was much less pronounced. We explain this significant enhancement of photoluminescence by a planarization of the conjugated polymer chains induced by photoexcitations even below the glass transition temperature, possibly due to an increased conjugation length. Interestingly, the photoluminescence remains at the enhanced level for more than 71 h after treatment of the films by illumination with light, likely due to the fact that below the glass transition temperature no restoring force could return the conjugated chains into their initial conformational state. © 2014 American Chemical Society.
    Citation
    Botiz I, Freyberg P, Leordean C, Gabudean A-M, Astilean S, et al. (2014) Enhancing the Photoluminescence Emission of Conjugated MEH-PPV by Light Processing. ACS Applied Materials & Interfaces 6: 4974–4979. Available: http://dx.doi.org/10.1021/am4060244.
    Sponsors
    I.B. thanks Anna Köhler, Eric Bittner, David Vanden Bout, Carlos Silva, Werner Stille, Günter Reiter, and Chung Wing Tsoi for fruitful discussions. I.B. and N.S. acknowledge financial support by the Deutsche Forschungsgemeinschaft through the Freiburg Institute for Advanced Studies (FRIAS). In addition, N.S. acknowledges her support by a European Research Council (ERC) Starting Independent Researcher Fellowship under the grant agreement No. 279587 and KAUST Competitive Research Grant (CRG-1-2012-THO-015).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Materials & Interfaces
    DOI
    10.1021/am4060244
    PubMed ID
    24611888
    ae974a485f413a2113503eed53cd6c53
    10.1021/am4060244
    Scopus Count
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