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Liquid Crystals Volume 49, 2022 - Issue 10
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Articles

Electrically controllable reflection bandwidth polymer-stabilized cholesteric liquid crystals with low operating voltage

Hongbo Lua National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei, China;b Anhui Province Key Laboratory of Advanced Functional Materials and Devices, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, ChinaCorrespondence[email protected]
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Qi Wanga National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei, China;b Anhui Province Key Laboratory of Advanced Functional Materials and Devices, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, ChinaView further author information
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Mengmeng Zhua National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei, China;b Anhui Province Key Laboratory of Advanced Functional Materials and Devices, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, ChinaView further author information
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Peng Huanga National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei, China;b Anhui Province Key Laboratory of Advanced Functional Materials and Devices, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, ChinaView further author information
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Miao Xua National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei, ChinaORCID Iconhttps://orcid.org/0000-0003-3610-0735View further author information
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Longzhen Qiua National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei, China;c Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Opto-Electronic Engineering, Hefei, ChinaView further author information
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Jun Zhua National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei, ChinaCorrespondence[email protected]
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Pages 1314-1321 | Received 08 Dec 2021, Accepted 11 Jan 2022, Published online: 28 Jan 2022
 
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ABSTRACT

An electrically controllable reflection bandwidth polymer-stabilised cholesteric liquid crystals (PSCLCs) with low operating voltage is reported. This work focuses on the contribution of the crosslink density of the polymer network to broaden the bandwidth and the ability of the polymer network to trap ionic impurities under direct-current (DC) electric fields. Furthermore, it is shown that the appearance of nonideal optical properties in some samples, such as scatter and haze, is correlated to the polymer/LC compatibility and the soft segments motion under DC electric field. Based on these results, a model relating the motion of the polymer network with the broadening of the reflection bandwidth and the baseline optical properties is developed. This study provides useful guidelines for future PSCLCs production and performance optimisation.

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Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplementary material

Supplemental data for this article can be accessed here.

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Funding

This work was supported by the National Key Research and Development Program of China [2019YFE0101300], National Natural Science Foundation of China [NSFC, Grant 61805066], Natural Science Foundation of Anhui Province [1708085MF150] and China Postdoctoral Science Foundation [Grant 2019M 652168].

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