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Synthesis and Analysis of Hyperbranched Oligofluorenes for Optoelectronic Applications
Clara Orofino, Anastasia Klimash, Alexander L. Kanibolotsky and Peter J. Skabara

Monodisperse oligofluorenes have an advantage over their polymeric counterparts due to the precise values of electronic energy levels, which are determined by their well-defined structure. They can be synthesized with high purity and exhibit complete batch-to-batch reproducibility of their physical properties. The extension of oligofluorene dimensionality by branching their conjugated backbone leads to star-shaped conjugated systems and dendrimers. Truxene and isotruxene units are natural branching points for oligofluorene systems, as they comprise the fluorene structure as a subunit and create star-shaped oligomers with a virtually no-core moiety. Dendrimers and star-shaped oligofluorenes exhibit increased solubility, improved film-forming, thermal, optical and electrochemical properties which make them attractive for optoelectronic applications.

Keywords: organic semiconductors, organic light-emitting diodes, oligofluorenes, truxene

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