Strong Exciton-Photon Coupling in a Nanographene Filled Microcavity

Dibenzo [hi,st] ovalene (DBOV)-a quasi-zero-dimensional nanographene-displays strong, narrow, and well-defined optical-absorption transitions at room temperature. On placing a DBOV-doped polymer film into an optical microcavity, we demonstrate strong coupling of the 0 -> 0' electronic transition to a confined cavity mode, with a coupling energy of 126 meV. Photoluminescence measurements indicate that the polariton population is distributed at energies approximately coincident with the emission of the DBOV, indicating a polariton population via an optical pumping mechanism.