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

Yoshihiro Honmou, Shuzo Hirata, Hideaki Komiyama, Junya Hiyoshi, Susumu Kawauchi, Tomokazu Iyoda and Martin Vacha ()
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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

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5666

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