| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9812860 | Thin Solid Films | 2005 | 5 Pages |
Abstract
A new series of Ï-conjugated [2,7-(9,9â²-dihexylfluorene)-co-alt-5,5â²-(2,2â²-bipyridine)] (fluorene-co-bpy) copolymers containing fac-(bpy)Re(I)(CO)3Cl (bpy=2,2â²-bipyridine, Re=rhenium) chromophores were synthesized and well characterized. The chelating copolymers showed characteristic MLCT absorption and emission at room temperature. Bonded Re complexes harvested excited energy efficiently through intra- and intermolecular energy from polymer backbone to Re complexes; however, both photoluminescence (PL) and electroluminescence (EL) efficiencies were unexpectedly lower. Such lower luminescent efficiency was conceivably related to charge carrier separation of localized electron-hole pairs (excitons) in fac-(bpy)Re(I)(CO)3Cl, which was induced by extensive Ï-conjugation. Further studies of density functional theory (DFT) calculation and surface photovoltaic spectra (SPS) afford proofs of charge carrier separation in fac-(bpy)Re(I)(CO)3Cl chelating polymers. The efficient charge carrier separation will decrease the efficiency of PL and EL but enhance the photovoltaic efficiency.
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Authors
M. Zhang, P. Lu, X.M. Wang, H. Xia, W. Zhang, B. Yang, L.L. Liu, L. Yang, M. Yang, Y.G. Ma, J.K. Feng, D.J. Wang,