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Stabilized electrically induced Helfrich deformation and enhanced color tuning in cholesteric liquid crystals

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Abstract

When subjected to an AC electric field perpendicular to its layers, the cholesteric planar state may undergo a periodic layer undulation, known as the Helfrich deformation, which generates a color change of the reflected light. The Helfrich deformation of regular cholesteric liquid crystals is, however, unstable and easily taken over by the focal conic state, and thus the color tuning range is narrow. We demonstrated that the Helfrich deformation can be stabilized in a large electric field region by doping a bent dimer with an anomalously small bend elastic constant and dispersing a small amount of polymer network. By varying the dimer concentration, we were able to systematically change the bend elastic constant and thus verify the theoretical prediction of the undulation threshold electric field and periodicity. We also achieved reflectance tuning with electric field less than 2 V μm−1 and color tuning covering the entire visible light region with electric field as low as 4 V μm−1.

Graphical abstract: Stabilized electrically induced Helfrich deformation and enhanced color tuning in cholesteric liquid crystals

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Publication details

The article was received on 07 Oct 2017, accepted on 07 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7SM01997A
Citation: Soft Matter, 2017, Advance Article
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    Stabilized electrically induced Helfrich deformation and enhanced color tuning in cholesteric liquid crystals

    M. Yu, H. Yang and D. Yang, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM01997A

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