title: Time-dependent aggregation-induced enhanced emission, absorption spectral broadening, and aggregation morphology of a novel perylene derivative with a large D-π-A structure.
abstract: Strong aggregation-caused quenching of perylene diimides (PDI) is changed successfully by simple chemical modification with two quinoline moieties through C=C at the bay positions to obtain aggregation-induced enhanced emission (AIEE) of a perylene derivative (Cya-PDI) with a large π-conjugation system. Cya-PDI is weakly luminescent in the well-dispersed CH(3)CN or THF solutions and exhibits an evident time-dependent AIEE and absorption spectra broadening in the aggregated state. In addition, morphological inspection demonstrates that the morphology of the aggregated form of Cya-PDI molecules changed from plate-shaped to rod-like aggregates under the co-effects of time and water. An edge-to-face arrangement of aggregation was proposed and discussed. The fact that the Cya-PDI aggregates show a broad absorption covering the whole visible-light range and strong intermolecular interaction through π-π stacking in the solid state makes them promising materials for optoelectric applications.
authors: State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065 (China), Fax: (+86) 028-85402465.
authors: Long
authors: L
authors: Yang
authors: Yuyan
authors: Y
authors: Yu
authors: Jin
authors: J
authors: Zhang
authors: Feijie
authors: F
authors: Ge
authors: Jianling
authors: J
authors: Zhang
authors: Long
authors: L
authors: Jiang
authors: Fang
authors: F
authors: Gao
authors: Yi
authors: Y
authors: Dan
keywords: aggregation-induced enhanced emission; donor-acceptor systems; perylene diimides; spectral broadening; time-dependent; π-π stacking