Synthesis and Analysis of Hyperbranched Oligofluorenes for Optoelectronic Applications †

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.