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Issue 22, 2011
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Synthesis of a novel smectic liquid crystalline glass and characterization of its charge carrier transport properties

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Abstract

A new organic semiconductor material with both a self-organized molecular alignment in smectic liquid crystals and a solid nature in amorphous materials, i.e., a glassy liquid crystalline organic semiconductor has been proposed, and its model compound, 1,3,5-benzenetricarboxylic acid, tris{12-[6′-(4′′-octylphenyl)-2′-naphthyloxy]-1-dodecyl ester} (LCG-triester 8-PNP-O12), was synthesized, and we characterized its phase transition behaviors in slow cooling and rapid cooling. It exhibited smectic A (SmA) and smectic B (SmBhex) phases in slow cooling, and a SmBhex glassy phase with a high Tg close to 60 °C when cooled rapidly from the SmA and SmBhex phases. Its charge carrier transport properties in the smectic mesophases, including the liquid crystal glassy phase, were first studied by the time-of-flight (TOF) technique, which revealed that the hole mobility in the SmBhex glassy phase was about 3.5 × 10−4 cm2 v−1s−1, comparable to that in the SmBhex liquid crystal phase. We concluded that the high charge transport properties of the smectic mesophase are successfully maintained in the solid glassy state.

Graphical abstract: Synthesis of a novel smectic liquid crystalline glass and characterization of its charge carrier transport properties

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Article information


Submitted
01 Mar 2011
Accepted
05 Apr 2011
First published
28 Apr 2011

J. Mater. Chem., 2011,21, 8045-8051
Article type
Paper

Synthesis of a novel smectic liquid crystalline glass and characterization of its charge carrier transport properties

J. Wu, T. Usui and J. Hanna, J. Mater. Chem., 2011, 21, 8045
DOI: 10.1039/C1JM10890E

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