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Single-molecule electroluminescence and photoluminescence of polyfluorene unveils the photophysics behind the green emission band

Author

Listed:
  • Yoshihiro Honmou

    (Tokyo Institute of Technology)

  • Shuzo Hirata

    (Tokyo Institute of Technology)

  • Hideaki Komiyama

    (Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuta-cho 4259, Midori-ku)

  • Junya Hiyoshi

    (Tokyo Institute of Technology)

  • Susumu Kawauchi

    (Tokyo Institute of Technology)

  • Tomokazu Iyoda

    (Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuta-cho 4259, Midori-ku)

  • Martin Vacha

    (Tokyo Institute of Technology)

Abstract

Optoelectronic properties of polyfluorene, a blue light-emitting organic semiconductor, are often degraded by the presence of green emission that originates mainly from oxidation of the polymer. Here, we use single-molecule electroluminescence (EL) and photoluminescence (PL) spectroscopy on polyfluorene chains confined in vertical cylinders of a phase-separated block copolymer to spectrally resolve the green band and investigate in detail the photophysical processes responsible for its appearance. In both EL and PL, a substantial fraction of polyfluorene chains shows spectrally stable green emission which is ascribed to a keto defect. In addition, in EL, we observe a new type of vibrationally resolved spectra distributed over a wide range of frequencies and showing strong spectral dynamics. Based on quantum chemical calculations, this type is proposed to originate from charge-assisted formation and stabilization of ground-state aggregates. The results are expected to have broad implications in the fields of photophysics and material design of polyfluorene materials.

Suggested Citation

  • Yoshihiro Honmou & Shuzo Hirata & Hideaki Komiyama & Junya Hiyoshi & Susumu Kawauchi & Tomokazu Iyoda & Martin Vacha, 2014. "Single-molecule electroluminescence and photoluminescence of polyfluorene unveils the photophysics behind the green emission band," Nature Communications, Nature, vol. 5(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5666
    DOI: 10.1038/ncomms5666
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