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Acta Chimica Sinica >

2020 , Vol. 78 >Issue 6: 478 - 489

DOI: https://doi.org/10.6023/A20040103

Review

Phototuning of Structural Colors in Cholesteric Liquid Crystals

  • Liu Xiaojun ,
  • Qin Lang ,
  • Zhan Yuanyuan ,
  • Chen Meng ,
  • Yu Yanlei
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  • a Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fundan University, Shanghai 200433;
    b South China Academy of Advanced Optoelectronics, SCNU-TUE Joint Lab of Device Integrated Responsive Materials(DIRM), South China Normal University, Guangzhou 510006;
    c Department of Materials Science, Fundan University, Shanghai 200433

Received date: 2020-04-09

  Online published: 2020-05-08

Supported by

Project supported by the National Natural Science Foundation of China (Nos. 51903053, 21734003, 51721002), the National Key R&D Program of China (No. 2017YFA0701302), the Innovation Program of Shanghai Municipal Education Commission (No. 2017-01-07-00-07-E00027), and the China Postdoctoral Science Foundation (Nos. 2019T120300, 2018M641923).

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Abstract

Cholesteric liquid crystals (CLCs) are a kind of intriguing soft photonic crystal materials, in which the orientation of LC molecules varies in a helical fashion, and selectively reflect light, known as structural color, according to Bragg's law. Moreover, the structural color determined by the pitch length of the helices in CLCs can be tuned owing to the dynamic control of inherent self-organized helical superstructures in response to external stimuli. Currently, light-driven CLCs have attracted extensive interest because light, compared to other stimuli, has unique advantages of remote, temporal, local and spatial manipulation. Such elegant systems are generally formulated by doping light-driven chiral switches, mainly consisting of chiral centers and photoswitches, into a nematic LC host. The chiral centers are able to twist the nematic LC host into helical superstructures, which is represented by helical twisting power (HTP). The photoswitches undergo configurational changes upon photoisomerization, leading to the variation in HTP and the pitch length of the helices, and consequently tune the structural color of the CLCs. These light-driven CLCs provide opportunities for various photonic applications such as tunable filters, sensors, tunable optical lasers, and optically addressed displays. In this review, we summarize diverse light-driven CLC systems according to the type of the photoswitch in doped chiral switches. Azobenzene-and motor-based chiral switches usually have high HTP and large variation in HTP, which enables the tuning range of the resultant CLC to cover visible spectrum. Besides, chiral switches based on dithienylethenes have also been synthesized and utilized to tune the reflection of the CLC across red, green and blue colors that remain unchanged in darkness even after one week because of the excellent thermal stability of dithienylethenes. Chiral switches based on dicyanoethene are used to construct an optically tunable reflective-photoluminescent CLC system. Importantly, the design of the light-driven chiral switches is analyzed in detail to reveal the structure-property correlation. Potential and demonstrated practical applications of light-driven CLCs are discussed, and forecast of existing challenges and opportunities in CLC systems are concluded.

Key words： cholesteric liquid crystal; light-driven chiral switch; structural color; helical superstructure; azobenzene

Cite this article

Liu Xiaojun , Qin Lang , Zhan Yuanyuan , Chen Meng , Yu Yanlei . Phototuning of Structural Colors in Cholesteric Liquid Crystals[J]. Acta Chimica Sinica, 2020 , 78(6) : 478 -489 . DOI: 10.6023/A20040103

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