Light-Harvesting Polymers: Ultrafast Energy Transfer in Polystyrene-Based Arrays of π-Conjugated Chromophores

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• 作者：Zhuo Chen ; Erik M. Grumstrup ; Alexander T. Gilligan ; John M. Papanikolas ; Kirk S. Schanze
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：January 9, 2014
• 年：2014
• 卷：118
• 期：1
• 页码：372-378
• 全文大小：438K
• ISSN：1520-5207

文摘

Energy transfer along a nonconjugated polymer chain is studied with a polystyrene-based copolymer of oligo(phenylene-ethynylene) (OPE) donor and thiophene-benzothiadiazole (TBT) acceptor pendants. The graft copolymers are prepared from reversible addition鈥揻ragmentation transfer polymerization (RAFT) and copper(I)-catalyzed azide鈥揳lkyne 鈥渃lick鈥?reaction. The singlet energy transfer from donor to accept is studied via fluorescence emission and ultrafast transient absorption spectroscopy. Near unity quenching of the OPE excited state by the TBT moiety occurs on multiple time scales (2鈥?0 ps) dependent on where the initial exciton is formed on the polymer.