We report the synthesis of a new series of oligomers derived from dibenzo[a,i]pyrene. The compounds were characterized by steady-state and transient absorption spectroscopies. The results indicate that the compounds fluoresce from a formally dark S1 electronic state that is enabled by intensity borrowing from a neighboring bright S2 state. While the monomer exhibits a relatively low photoluminescence quantum yield (PLQY), the dimer exhibits a significantly enhanced PLQY due to a greater S2 intensity borrowing. Moreover, symmetry-breaking charge transfer in the dimer was demonstrated by investigations in solvents of different polarity.
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