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Fluorescence dynamics of thiophene-based copolymer/fullerene-derivative system as solution and blend film

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Abstract

A system of dimethyl ester of 3,3′′′′-bisdecyl[2,2′:5′,2″:5″,2′′′:5′′′,2′′′′:5′′′′,2′′′′′]sexithiophene-5,5′′′′′-dicarboxylic acid, with polyethylene oxide, copolymer (ST) and [6,6]phenyl-C61-butyric acid methyl ester (PCBM) is of photochemical interest. A focus is on dynamics within the ST/PCBM donor/acceptor system as a solution and as a film by means of fluorescence spectroscopy, cyclic voltammetry, and atomic force microscopy. ST forms intra-molecular rod–coil aggregates in the solution and terraces of aggregates in the film. ST/PCBM fluorescence spectra from the solution:film result in a spectral red shift of 60 nm and intensity decrease with a ratio of 17:8, respectively. The fluorescence decay times τ1 increase with increasing PCBM concentration from 17.0 to 25.5 ps and from 5.8 to 19 ps in the solutions and the films, respectively. Interestingly, the decay time τ2 result for the solutions and for the films to be on average 491 ps and 78 ps, describing the slower and the faster overall process, respectively. HOMO/LUMO levels for ST and PCBM are − 7.27 eV/− 4.42 eV and − 6.68 eV/− 4.43 eV, respectively. Excitation energy transfer between ST and PCBM is observed as radiative quenching and static quenching through the disaggregation of the ST aggregates by PCBM molecules.

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Acknowledgements

This work was supported by the APVV-15-0201, VEGA 1-0400-16, VEGA 1-0501-15, SK-PT-0015-12, Fundação para a Ciência e Technologia (FCT) (SK-PT-0015-12), (SFRH/BD/75026/2010), CMP, FCT and CIQUP (Pest-C/QUI/U10081/2013).

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Authors and Affiliations

  1. Department of Physical and Theoretical Chemistry, Comenius University, Bratislava, Slovakia

    Marianna Gregová Trenčanová, Daniel Repovský, Mária Lujza Marčáková, Eva Noskovičová & Dusan Velic

  2. International Laser Centre, Bratislava, Slovakia

    Daniel Repovský, Ľudovít Haizer, Vojtech Szőcs, Eva Noskovičová & Dusan Velic

  3. Department of Chemistry and Biochemistry, University of Porto, Porto, Portugal

    Inês Miranda & Carlos Manuel Melo Pereira

  4. Department of Environmental Engineering, Slovak University of Technology, Bratislava, Slovakia

    Gabriel Čík

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  1. Marianna Gregová Trenčanová
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Correspondence to Eva Noskovičová.

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Trenčanová, M.G., Repovský, D., Marčáková, M.L. et al. Fluorescence dynamics of thiophene-based copolymer/fullerene-derivative system as solution and blend film. Monatsh Chem 153, 1087–1098 (2022). https://doi.org/10.1007/s00706-022-02941-9

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  • DOI: https://doi.org/10.1007/s00706-022-02941-9

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