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Liquid Crystals Volume 47, 2020 - Issue 11
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Article

Polymer-stabilised cholesteric liquid-crystals as tunable light-reflector with low operating-voltage and energy consumption

Qiang Zhanga 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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Xinming Zhanga 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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Le Yanga 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 School of Electronic Science & Applied Physics, 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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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, ChinaView further author information
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Guobing Zhanga 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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Yunsheng Dingb 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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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;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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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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Pages 1655-1662 | Received 12 Dec 2019, Accepted 08 Apr 2020, Published online: 29 Apr 2020
 
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ABSTRACT

The reflection bandwidth of polymer-stabilised cholesteric liquid-crystals (PSCLCs), with negative dielectric-anisotropy, can be broadened by applying a direct-current (DC) electric field. This class of materials is particularly interesting for its use in displays, optical storages, tunable lasers, or energy-conserving windows. The transient- and steady – currents across PSCLCs under DC voltages can be used to study the spatial distribution of charged bodies and the motion of the polymer network. Our results indicate that the shielding effect of both the electric double layers (EDLs) and alignment layers is the main reason for voltage loss. The electric-field threshold for reflection-band broadening decreases to 0.05 V/μm after the alignment layers were removed, and the power consumption also drops by nearly tenfold. This study helps to improve the fabrication of energy-saving devices and to explore new ways to improve PSCLCs.

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Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

Supplemental data for this article can be accessedhere.

Additional information

Funding

This study was supported by Natural Science Foundation of Anhui Province, China (1708085MF150); National Natural Science Foundation of China (NSFC) (61107014, 51573036); Distinguished Youth Foundation of Anhui Province (1808085J03) and the Fundamental Research Funds for the Central Universities (Grant No. JZ2018HGPB0276).

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