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    Tuning intermolecular interactions in di-octyl substituted polyfluorene via hydrostatic pressure

    Paudel, Keshab Raj, 1973-
    Chandrasekhar, Meera
    Guha, Suchi
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    [PDF] TuningIntermolecularInteractionsDiOctyl.pdf (511.6Kb)
    Date
    2009
    Format
    Article
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    Abstract
    Polyfluorenes (PFs) represent a unique class of poly para-phenylene based blue-emitting polymers with intriguing structure-property relationships. Slight variations in the choice of functionalizing side chains result in dramatic differences in the inter- and intra-chain structures in PFs. We present photoluminescence (PL) and Raman scattering studies of bulk samples and thin films of dioctyl-substituted PF (PF8) under hydrostatic pressure. The bulk sample was further thermally annealed at 1.9 GPa. The PL vibronics of the as-is sample red-shift at an average rate of 26 meV/GPa. The thermally annealed sample is characterized by at least two phase transitions at 1.1 GPa and 4.2 GPa, each of which has a different pressure coefficient for PL vibronics. The Huang-Rhys factor, a measure of the electron-phonon interaction, is found to increase with increasing pressures signaling a higher geometric relaxation of the electronic states. The Raman peaks harden with increasing pressures; the intra-ring C-C stretch frequency at 1600 cm$^{-1}$ has a pressure coefficient of 7.2 cm$^{-1}$/GPa and exhibits asymmetric line shapes at higher pressures, characteristic of a strong electron-phonon interaction. The optical properties of PF8 under high pressure are further contrasted with those of a branched side chain substituted PF.
    URI
    http://hdl.handle.net/10355/6804
    Citation
    arXiv:0905.1736v1
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    • Physics and Astronomy publications (MU)

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