Novel nonplanar triphenylamine-centered oligofluorenes: Synthesis, thermal, photophysical and electrochemical properties

► Novel nonplanar oligofluorenes consisting of triphenylamine (TPA) derivatives as the core and oligofluorenes as the peripheries were facilely prepared via CF3SO3H-promoted Friedel-Crafts and Suzuki cross-coupling reactions. ► These as-prepared compounds effectively solve the spectral stability problem and hole-injection issue for fluorene-based materials. ► The ability of hole-injection and emission color could be fine tuned by R substituent at the C4 position of TPA.