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Tuning of luminescence color of π-conjugated liquid crystals through co-assembly with ionic liquids

Abstract

Luminescent oxadiazole-based columnar liquid crystals containing a diethanolamine moiety forming intramolecular donor-acceptor charge transfer states have been designed and synthesized. These molecules exhibit strong solvatochromism depending on the solvent polarity. Co-assembly of oxadiazole derivatives and nonvolatile 1-buthyl-3-methylimidazolium-based ionic liquids through hydrogen bonds leads to the formation of thermally stable nanosegregated columnar structures with confined channels of ionic liquids. Modulation of the emission color from light-blue to blue-green in the liquid-crystalline states has been achieved by incorporating the ionic liquid. This red-shifted emission can be attributed to the stabilization of the excited intramolecular charge transfer state of the donor-acceptor luminophore by polar molecules. The presented tunable luminescent soft materials obtained through noncovalent supramolecular approaches will open a new avenue in the fields of optoelectronic organic materials.

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Publication details

The article was received on 21 Jun 2017, accepted on 01 Sep 2017 and first published on 01 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC02767B
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Tuning of luminescence color of π-conjugated liquid crystals through co-assembly with ionic liquids

    M. Mitani, M. Yoshio and T. Kato, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02767B

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