Singlet Excitation Energy Harvesting And Triplet Emission In The Self-assembled System Poly{1 ,4-phenylene-[9,9-bis(4-phenoxy-butylsulfonate)]fluorene-2,7-diyl} Copolymer/tris(bipyridyl)ruthenium(ii)rnin Aqueous Solution

摘要

Electronic energy transfer in conjugated polymers is of both theoretical and practical importance. At the theoretical level, the study of on-chain and interchain energy transfer is helping reveal the mechanism of exciton migration in conjugated polymers, which is of fundamental importance for their application in many optoelectronic devices. Interest at the practical level extends from color tuning in light-emitting devices to applications in chemical and biological sensors. Fluorene-based copolymers are particularly attractive as energy donors in Forster Resonance Energy Transfer (FRET), because their high fluorescence quantum yields and blue emission allow efficient transfer to acceptors, emitting over the whole visible and near-infrared spectrum. In addition, using complexes containing heavy metals, such as Ir, Pt, or Ru, it is possible to capture both singlet-and triplet-state energy, and produce high efficiency electrophos-phorescent devices.Whilst triplet-energy transfer to metal complexes normally involves the short-range Dexter (exchange) mechanism, it is anticipated that the efficiency of this process can be optimized if both this and the long-range F6rster(dipole-dipole) mechanisms are involved.