title: Light-harvesting polymers: ultrafast energy transfer in polystyrene-based arrays of π-conjugated chromophores.
abstract: 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-fragmentation transfer polymerization (RAFT) and copper(I)-catalyzed azide-alkyne "click" 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 (2-50 ps) dependent on where the initial exciton is formed on the polymer.
authors.affiliation: Department of Chemistry and Center for Macromolecular Science and Engineering, University of Florida , P.O. Box 117200, Gainesville, Florida 32611-7200, United States.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Chen
authors.forename: Erik M
authors.initials: EM
authors.lastname: Grumstrup
authors.forename: Alexander T
authors.initials: AT
authors.lastname: Gilligan
authors.forename: John M
authors.initials: JM
authors.lastname: Papanikolas
authors.forename: Kirk S
authors.initials: KS
authors.lastname: Schanze