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Spectral properties and photophysics of arylacetylenes in thin films

Rebecca Flamini
  • Department of Chemistry, and Centro di Eccellenza sui Materiali Innovativi Nanostrutturati (CEMIN), University of Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
/ Benedetta Carlotti
  • Department of Chemistry, and Centro di Eccellenza sui Materiali Innovativi Nanostrutturati (CEMIN), University of Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
/ Anna Spalletti
  • Department of Chemistry, and Centro di Eccellenza sui Materiali Innovativi Nanostrutturati (CEMIN), University of Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
/ Assunta Marrocchi
  • Department of Chemistry, and Centro di Eccellenza sui Materiali Innovativi Nanostrutturati (CEMIN), University of Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
Published Online: 2014-02-19 | DOI: https://doi.org/10.2478/oph-2014-0001


We report the photobehaviour of a series of eight structurally related arylacetylene derivatives, in solution as well as in pristine and PC61BM blended thin-_lms. The formation of both H- and J-aggregates in the solid state have been demonstrated, and, interestingly, an energy transfer from H-aggregates or/and from residual "unstacked" molecules to J-aggregates has been found, the latter being the only emitting species. The fuorescence quenching by PC61BM at di_erent loadings has been studied in blend films, and it has been found particularly effcient in the case of a symmetrical peripheral substitution of the acetylene derivative core. Preliminary time-resolved measurements in emission (ns resolution) and in absorption (fs resolution) con_rmed the H⟶J energy transfer and underlined the presence of delayed fuorescence from Jaggregates, formed by energy transfer from the long-lived first excited singlet state of H-aggregates. In all cases, a homogeneous surface morphology of thin films.

Keywords: small molecule organic semiconductors; thin film; J-aggregate; H-aggregate; energy transfer

PACS: 78.20.-e; 78.40.Fy; 78.47.jb; 78.66.Sq; 78.66.Qn


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About the article

Received: 2013-10-21

Accepted: 2013-10-26

Published Online: 2014-02-19

Citation Information: Organic Photonics and Photovoltaics, ISSN (Online) 2299-3177, DOI: https://doi.org/10.2478/oph-2014-0001. Export Citation

©2014 Anna Spalletti et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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