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Issue 28, 2015
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Strong main-chain length-dependence for the β-phase formation of oligofluorenes

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Abstract

Poly-/oligofluorenes are promising luminescent materials applicable in organic light emitting diodes, lasers, etc. In particular, the β-phase structure, in which the fluorene main chain adopts a planar conformation with extended conjugation, shows characteristic optical properties. In this study, we have synthesized oligo(9,9′-dioctylfluorenes) whose chain lengths (n) are n = 9, 12, 15, 18, 21, 24 and 27 mers. Interestingly, the β-phase formation of the oligofluorenes is observed remarkably for oligofluorenes with n > 15, which is confirmed by the UV/vis and fluorescence spectroscopy. This study elucidates the structure–property relationship required to design high performance fluorene-based materials. Such a chain-length-dependent optical property provides useful information for utilizing the materials in many applications.

Graphical abstract: Strong main-chain length-dependence for the β-phase formation of oligofluorenes

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Publication details

The article was received on 17 Mar 2015, accepted on 10 Jun 2015 and first published on 11 Jun 2015


Article type: Paper
DOI: 10.1039/C5PY00385G
Citation: Polym. Chem., 2015,6, 5103-5109
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    Strong main-chain length-dependence for the β-phase formation of oligofluorenes

    T. Shiraki, S. Shindome, F. Toshimitsu, T. Fujigaya and N. Nakashima, Polym. Chem., 2015, 6, 5103
    DOI: 10.1039/C5PY00385G

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