A bistable light shutter based on polymer stabilized cholesteric liquid crystals

He, Zemin; Zeng, Juntao; Zhu, Shoumin; Zhang, Dongxia; Ma, Cheng; Zhang, Cuihong; Yu, Panxi; Miao, Zongcheng

doi:10.1016/j.optmat.2022.113426

Cited by 20 publications

(7 citation statements)

References 32 publications

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“…In the case of PSCLCs, a bistable switching effect can be attained by using either positive Δε or negative Δε LC hosts, depending on the processing conditions. Bistable switching PSCLCs have two modes: normal mode [ 5 , 18 , 19 , 36 , 37 ] and reverse mode [ 5 , 20 , 21 , 36 , 37 , 38 ]. In normal mode, the PSCLC switches from a scattering state to a clear state.…”

Section: Electro-optic Response In Psclcsmentioning

confidence: 99%

“…The polymer network of PSCLCs can also lock the pitch of a CLC, and it affects various optical responses. Stabilizing low molar mass CLCs with positive Δε using polymer networks allows for fast and bistable switching between reflective and scattering textures [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 36 , 37 , 38 ]. These composite systems are described as PSCLCs, but, in the past, these systems were also known as polymer-stabilized cholesteric textures (PSCTs).…”

Section: Introductionmentioning

confidence: 99%

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Recent Advances in Electro-Optic Response of Polymer-Stabilized Cholesteric Liquid Crystals

et al. 2023

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Cholesteric liquid crystals (CLC) are molecules that can self-assemble into helicoidal superstructures exhibiting circularly polarized reflection. The facile self-assembly and resulting optical properties makes CLCs a promising technology for an array of industrial applications, including reflective displays, tunable mirror-less lasers, optical storage, tunable color filters, and smart windows. The helicoidal structure of CLC can be stabilized via in situ photopolymerization of liquid crystal monomers in a CLC mixture, resulting in polymer-stabilized CLCs (PSCLCs). PSCLCs exhibit a dynamic optical response that can be induced by external stimuli, including electric fields, heat, and light. In this review, we discuss the electro-optic response and potential mechanism of PSCLCs reported over the past decade. Multiple electro-optic responses in PSCLCs with negative or positive dielectric anisotropy have been identified, including bandwidth broadening, red and blue tuning, and switching the reflection notch when an electric field is applied. The reconfigurable optical response of PSCLCs with positive dielectric anisotropy is also discussed. That is, red tuning (or broadening) by applying a DC field and switching by applying an AC field were both observed for the first time in a PSCLC sample. Finally, we discuss the potential mechanism for the dynamic response in PSCLCs.

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Section: Electro-optic Response In Psclcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Advances in Electro-Optic Response of Polymer-Stabilized Cholesteric Liquid Crystals

et al. 2023

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“…However, the polymer content must be controlled within the critical range, beyond which the ordered planar arrangement of the liquid crystal is disturbed by a dense polymer network, and the disorder increases as the polymer concentration increases. This will result in a decrease in the maximum transmittance of the device and a decrease in the contrast of the device [ 65 ]. Li et al reported a bistable ion-doped cholesteric liquid crystal smart window with a small amount of polymer.…”

Section: Performance Optimizationmentioning

confidence: 99%

Research Progress of Electrically Driven Multi-Stable Cholesteric Liquid Crystals

Wang,

Hu,

et al. 2023

Materials

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Electrically driven multi-stable cholesteric liquid crystals can be used to adjust the transmittance of incident light. Compared with the traditional liquid crystal optical devices, the multi-stable devices only apply an electric field during switching and do not require a continuous electric field to maintain the various optical states of the device. Therefore, the multi-stable devices have low energy consumption and have become a research focus for researchers. However, the multi-stable devices still have shortcomings before practical application, such as contrast, switching time, and mechanical strength. In this article, the latest research progress on electrically driven multi-stable cholesteric liquid crystals is reviewed, including electrically driven multi-stable modes, performance optimization, and applications. Finally, the challenges and opportunities of electrically driven multi-stable cholesteric liquid crystals are discussed in anticipation of contributing to the development of multi-stable liquid crystal devices.

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“…The scattering based technologies include polymer dispersed liquid crystals (PDLCs), [16][17][18][19][20][21] polymer stabilized liquid crystal (PSLC), [22][23][24][25][26][27][28][29] and polymerstabilized cholesteric textures (PSCTs). [30][31][32][33][34][35][36][37] In one state under a specific voltage condition, the liquid crystal in the window is in an optically uniform state and is transparent. In another state with a different voltage condition, the liquid crystal is in a multidomain state and is scattering.…”

Section: Introductionmentioning

confidence: 99%

Smart Switchable Window with Bistability and Tunability of Transmission

Zhou,

Zhang,

Halder

et al. 2024

Advanced Optical Materials

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Windows are used everywhere, from buildings to vehicles. Smart switchable windows are highly sought‐after in order to reduce energy consumption. An ideal smart window should have two functions. First, it should be able to control privacy. Second, it should be able to control radiant energy flow. Here, a smart window is reported that possesses the two functions. The smart window is based on a dichroic dye‐doped cholesteric liquid crystal. It exhibits two stable states in the absence of applied voltage. One of them is the planar state that is optically absorbing without haze and can control radiant energy flow. The other state is the focal conic state that is optically scattering and can control privacy. Furthermore, when voltage is applied, the liquid crystal is switched to a heliconical state, where the transmittance can be tuned continuously. Thanks to its superior performance, this smart window has a big potential for applications in architectural and vehicle windows.

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A bistable light shutter based on polymer stabilized cholesteric liquid crystals

Cited by 20 publications

References 32 publications

Recent Advances in Electro-Optic Response of Polymer-Stabilized Cholesteric Liquid Crystals

Recent Advances in Electro-Optic Response of Polymer-Stabilized Cholesteric Liquid Crystals

Research Progress of Electrically Driven Multi-Stable Cholesteric Liquid Crystals

Smart Switchable Window with Bistability and Tunability of Transmission

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