Article

Managing Photoexcited States in Conjugated Polymers

  1. Gerhard Wegner1,*,
  2. Stanislav Baluschev1,
  3. Frederic Laquai2,
  4. Chunyan Chi3

Article first published online: 21 JUL 2008

DOI: 10.1002/masy.200850801

Issue

Macromolecular Symposia

Macromolecular Symposia

Special Issue: Advanced Polymer Materials for Photonics and Electronics

Volume 268, Issue 1, pages 1–8, July 2008

Additional Information

How to Cite

Wegner, G., Baluschev, S., Laquai, F. and Chi, C. (2008), Managing Photoexcited States in Conjugated Polymers. Macromol. Symp., 268: 1–8. doi: 10.1002/masy.200850801

Author Information

  1. 1

    Max-Planck-Institute for Polymer Research - Mainz, P.O.Box 3148, D-55021 Mainz/Germany

  2. 2

    University of Cambridge, Cavendish Laboratory, OE Group,Cambridge CB3 0HE, UK.

  3. 3

    U. of California, Department of Chemistry, Santa Barbara CA, USA

*Max-Planck-Institute for Polymer Research - Mainz, P.O.Box 3148, D-55021 Mainz/Germany.

Publication History

  1. Issue published online: 21 JUL 2008
  2. Article first published online: 21 JUL 2008

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Keywords:

  • energy-upconversion;
  • fluorescence;
  • phosphorescence;
  • triplet-triplet annihilation

Abstract

Summary: 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 non-coherent energy upconversion at ultralow excitation intensity (ca 1 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.

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