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Abstract

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

, 2011, 1720–1727. [47] Grigoras M., Vacareanu L., Ivan T., Catargiu A.M., Photophysical properties of isoelectronic oligomers with vinylene, imine, azine and ethynylene spacers bearing triphenylamine and carbazole end-groups , Dyes Pigm. 98, 2013, 71–81. [48] Mishra A., Bäuerle P., Small Molecule Organic Semiconductors on the Move: Promises for Future Solar Energy Technology , Angew. Chem. Int. Ed. 51, 2012, 2020–2067.

- dellbasierter Ansatz zur Regelung der stationären Verdampfung organischer Halbleiter im Hochvakuum, International Journal Automation Austria 19 (1) (2011), S. 15–24. [7] Steinberger, M., Horn, M., Fian, A., Jakopic, G.: Investigations on the thermal behaviour of evaporation cells for small molecule organic semiconductors, International Conference on Organic Electronics, Paris, 2010. [8] Jousten, K. (Hrsg.): Wutz Handbuch Vakuumtechnik, Theorie und Praxis, Vieweg, 2006. [9] Baehr, H. D., Stephan, K.: Wärme- und Stoffübertragung, Springer, 2006. [10] Steinberger, M

stand next to each other and perpendicular to the linking bond, allowing them to overlap and form so called π orbitals, cf. Figure 1. These electrons are weaker bound and, hence, much more delocalized than electrons in σ orbitals. This, again, leads to an overlap with the single bonds, allowing to easily move electrons occupying π orbitals from one bond to the next and therefore resulting in one-dimensional semiconductors.While in poly- mers this intramolecular transport along the chain is themost important contribution, what counts in small molecule organic

example, polyphenylene vinylene, polyfluorene, polythiophene, and carbon fullerenes. Two main types of organic semiconductor materials are small-molecule organic semiconductor and long-chain polymeric organic semiconductor. In the past two decades, electroconductive polymers have become a major compet- itor to inorganic semiconductor materials, such as silicon Polymer blend Hole conductor Transparent anode Flexible substrateLight Cathode I/V Organic Photovoltaic Cell 512   organic solar cell and gallium arsenide, due to their mechanical strength, simplified