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White Electroluminescence by Supramolecular Control of Energy Transfer in Blends of Organic-Soluble Encapsulated Polyfluorenes

  1. Sergio Brovelli2,
  2. Francesco Meinardi3,
  3. Gustaf Winroth2,
  4. Oliver Fenwick2,
  5. Giuseppe Sforazzini1,
  6. Michael J. Frampton1,
  7. Leszek Zalewski1,4,
  8. James A. Levitt5,
  9. Francesco Marinello6,7,
  10. Piero Schiavuta7,
  11. Klaus Suhling5,
  12. Harry L. Anderson1,*,
  13. Franco Cacialli2,*

Article first published online: 16 DEC 2009

DOI: 10.1002/adfm.200901764

Issue

Advanced Functional Materials

Advanced Functional Materials

Volume 20, Issue 2, pages 272–280, January 22, 2010

Additional Information

How to Cite

Brovelli, S., Meinardi, F., Winroth, G., Fenwick, O., Sforazzini, G., Frampton, M. J., Zalewski, L., Levitt, J. A., Marinello, F., Schiavuta, P., Suhling, K., Anderson, H. L. and Cacialli, F. (2010), White Electroluminescence by Supramolecular Control of Energy Transfer in Blends of Organic-Soluble Encapsulated Polyfluorenes. Adv. Funct. Mater., 20: 272–280. doi: 10.1002/adfm.200901764

Author Information

  1. 1

    Department of Chemistry University of Oxford Chemistry Research Laboratory Mansfield Road, Oxford OX1 3TA (UK)

  2. 2

    Department of Physics and Astronomy (CMMP Group) and London Centre for Nanotechnology University College London Gower Street, London WC1E 6BT (UK)

  3. 3

    Dipartimento di Scienza dei Materiali Università di Milano-Bicocca via Cozzi 53, Milano I-20125 (Italy)

  4. 4

    BASF SE GKD/I 67056 Ludwigshafen (Germany)

  5. 5

    Department of Physics King's College London Strand, London WC2R 2LS (UK)

  6. 6

    Dipartimento di Innovazione Meccanica e Gestionale via Venezia 1, Padova I-35131 (Italy)

  7. 7

    CIVEN-Coordinamento Interuniversitario Veneto per le Nanotecnologie via della Industrie 5, Venezia Marghera I-30175 (Italy)

*Department of Chemistry University of Oxford Chemistry Research Laboratory Mansfield Road, Oxford OX1 3TA (UK).

Publication History

  1. Issue published online: 13 JAN 2010
  2. Article first published online: 16 DEC 2009
  3. Manuscript Received: 14 SEP 2009

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Keywords:

  • energy transfer;
  • rotaxanes;
  • white-light-emitting diodes

Abstract

Here, it is demonstrated that energy transfer in a blend of semiconducting polymers can be strongly reduced by non-covalent encapsulation of one constituent, ensured by threading of the conjugated strands into functionalized cyclodextrins. Such macrocycles control the minimum intermolecular distance of chromophores with similar alignment, at the nanoscale, and therefore the relevant energy transfer rates, thus enabling fabrication of white-light-emitting diodes (CIE coordinates: x = 0.282, y = 0.336). In particular, white electroluminescence in a binary blend of a blue-emitting, organic-soluble rotaxane based on a polyfluorene derivative and the green-emitting poly(9,9-dioctylfluorene-alt-benzothiadiazole (F8BT) is achieved. Morphological and structural analyses by atomic force microscopy, fluorescence mapping, µ-Raman, and fluorescence lifetime microscopy are used to complement optical and electroluminescence characterization, and to enable a deeper insight into the properties of the novel blend.

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