Managing photoexcited states in conjugated polymers

Gerhard Wegner*, Stanislav Baluschev, Frederic Laquai, Chunyan Chi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Chain length dependence of the photoemission (fluorescence, phosphorescence, delayed fluorescence) and the respective life times of poly conjugated macromolecules is subject of controversy since long. An underlying question concerns coherence and extension/localization of the photoexcited states. Energy transfer within and between macromolecules as well as between sensitizers and macromolecules are relevant processes in systems to be used for displays or solar energy harvesting. In this context our recent work on photophysical characterization of pure oligo(fluorene)s and of the same oligomers containing just one fluorenone ("keto-defect") group is reviewed. Energy transfer between poly(fluorene)s and metal porphyrins is also covered. Triplet- triplet-annihilation opens a route to efficient noncoherent energy upconversion at ultralow excitation intensity (ca i Wcm-2). Light from the red region (635-700 nm) of terrestrial sun-light is converted into the green region with ΔE≥0-5 eV.

Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalMacromolecular Symposia
Volume268
Issue number1
DOIs
StatePublished - Jul 1 2008

Keywords

  • Energy-upconverslon
  • Fluorescence
  • Phosphorescence
  • Triplet-triplet annihilation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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