Exciton localization hierarchy and directed energy transfer in conjugated linear aromatic chains and dendrimeric supermolecules

Stephen F. Swallen, Zhong You Shi, Weihong Tan, Zhifu Xu, Jeffrey S. Moore, Raoul Kopelman

Research output: Contribution to journalArticlepeer-review

Abstract

A unique class of phenylacetylene dendrimer supermolecules have been studied in terms of their electronic absorption and energy-transfer characteristics. Discrete exciton localization on isolated absorbing units within the dendrimer backbone is observed. Due to the branching structure, the vibrationless ground-state absorption is energetically pinned, showing complete independence of absorption energy with changes in molecular size. A simple linear-chain interacting oscillator model is used to calculate the band-edge energies of three isolated linear ring systems: poly(p-phenylenevinylene) (PPV), polytolans, and the dendrimer series. These calculations compare favorably with the experimental data, further illustrating the tight excitation localization.

Original languageEnglish (US)
Pages (from-to)193-196
Number of pages4
JournalJournal of Luminescence
Volume76-77
DOIs
StatePublished - Feb 1998

Keywords

  • Dendrimers
  • Energy tranfer
  • Exciton
  • Localization
  • Polytolans
  • PPV

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

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