Synthesis and Physical Properties of Polyfluorene Derivative with Imidazolium Units

A new polyfluorene derivative (PF-ImBr) with imidazole cations as side chains was synthesized to achieve a bidirectional photo-electro conversion by single-component polymer light-emitting electrochemical cell and photovoltaic cell with frozen p-i-n junction at room temperature. Various physical pro...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2010-01, Vol.520 (1), p.1/[277]-9/[285]
Main Authors: Heo, Hyo Jung, Nagamura, Toshihiko
Format: Article
Language:English
Subjects:
Cations
Chains (polymeric)
Chemical synthesis
Derivatives
Fluorescence
Freezing
Frozen
Ionic polyfluorene derivative
P-i-n junctions
Photovoltaic cells
Physical properties
polymer frozen p-i-n junction
polymer light-emitting electrochemical cell
Polymers
thermal properties
ultrafast dynamics
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Summary:A new polyfluorene derivative (PF-ImBr) with imidazole cations as side chains was synthesized to achieve a bidirectional photo-electro conversion by single-component polymer light-emitting electrochemical cell and photovoltaic cell with frozen p-i-n junction at room temperature. Various physical properties of this polymer such as UV-vis absorption and fluorescence spectra, transient absorption, fluorescence lifetime, and thermograms were studied. The optical band gap value of PF-ImBr was estimated as 2.9 eV. The transient absorption spectra and fluorescence lifetime results strongly suggested no electronic interactions between fluorene chromophores in the main chain and imidazolium cations in the side chain. PF-ImBr film with a fluorescent chromophore and two cations in the repeating units can form a single component frozen p-i-n junction after being heated above 130°C.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421401003604229