Comprehensive photophysical studies of polyfluorenes containing on-chain emissive defects

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Abstract
We present a comprehensive study of the photoexcitation dynamics in fluorenone-free and fluorenone-containing polyfluorenes both on the femtosecond and the millisecond time scale. In the fluorenone-free polyfluorene a small amount of polarons are observed, which form instantaneously. Triplets are the dominant species on the ms time scale. In fluorenone-containing polyfluorenes a considerable fraction of the excitation energy is transferred to the fluorenone units, which act as energy sinks. Their lowest excited state is of charge-transfer nature and can dissociate into polarons, while no triplets are revealed.