Dual-Mode Switchable Liquid-Crystal Window

Jiang, Yingfei; Shin, Young Sik; Yang, Deng‐Ke

doi:10.1103/physrevapplied.12.054037

Cited by 16 publications

(13 citation statements)

References 49 publications

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“…[6][7][8][9][10] Polymer dispersive liquid crystals (PDLCs), polymer network liquid crystals (PNLCs), and cholesteric liquid crystals (CLCs) have been studied for years to achieve the control of haze value. [11][12][13][14][15][16][17][18] In artificial lighting devices, such as daylight lamps or desk lamps, the lighting distribution is well designed with mirrors or masks. In contrast, it is difficult to control the lighting area when sunlight enters into a room.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Liquid Crystal Smart Glass with Light Field Shaping, Dimming, and Scattering Control

Chang

Lin

Tseng

et al. 2022

Advanced Photonics Research

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Glass with multiple light control functions has received considerable attention in recent years. This study demonstrates a multifunctional smart glass composed of hybrid‐aligned ion‐doped nematic liquid crystals (LCs). In the absence of an applied electric field, the hybrid aligned LC is transparent and can be used for light field shaping. The transmittance of the glass can be limited to less than 2% with a 1D oblique viewing angle of >50°. In addition, by varying the frequency and strength of the electric field applied to the device, tinted and scattering states can be achieved with polarization rotation and the electrohydrodynamic effect, respectively. The nonscattering tinted state can control transmittance in the range from 38% to 0.2%. The scattering state provides a 99% high‐haze performance. These results demonstrate that the proposed smart glass can be used for meeting the novel requirements of the next generation of green and smart buildings and vehicles.

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Section: Introductionmentioning

confidence: 99%

Multifunctional Liquid Crystal Smart Glass with Light Field Shaping, Dimming, and Scattering Control

Chang

Lin

Tseng

et al. 2022

Advanced Photonics Research

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“…Guest–host liquid crystals (GHLCs) are used in the smart windows due to their low power consumption and fast response. They consist of guest dichroic dye molecules and host LCs, in which the dye molecules can be easily aligned with the directors of the host LC molecules . GHLC cell’s transmittance is determined by the alignment of the dye molecules, the dye’s absorption coefficient, the cell gap, and the dye concentration .…”

Section: Introductionmentioning

confidence: 99%

“…They consist of guest dichroic dye molecules and host LCs, in which the dye molecules can be easily aligned with the directors of the host LC molecules. 25 GHLC cell's transmittance is determined by the alignment of the dye molecules, the dye's absorption coefficient, the cell gap, and the dye concentration. 26 The two modes that are generally available for the guest−host liquid crystal (GHLC) smart windows are related to when the window is in its transparent "on" state and its dark "off" state.…”

Section: ■ Introductionmentioning

confidence: 99%

Controlling the Pretilt Angles of Guest–Host Liquid Crystals via a Hydrophilic Polyimide Layer through Oxygen Plasma Treatment

Liang

Wang

Zhu

et al. 2022

ACS Appl. Electron. Mater.

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The control of the liquid crystal (LC) alignment is an important factor for practical applications. The conventional method typically used is the rubbing of the polyimide (PI) layer. However, it is difficult to obtain intermediate pretilt angles by employing such a method. In this paper, control of the pretilt angle of the LC is achieved by modifying the surface wettability of the PI films via oxygen plasma treatment. A new mode for guest–host liquid crystal (GHLC) smart windows is achieved with intermediate initial transmittance by controlling the pretilt angle, which can turn from the initial state to either the transparent or dark states. Different modes for the GHLC-based smart windows can be fabricated that are dependent on the environmental conditions.

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“…Smart window with adjustable visible light transmittance has attracted a lot of attention in academia and industry because of its easy control, elegant appearance and significant improvement in the comfort of building residents, and has been applied to various fields such as architecture, transportation, electronics or optical devices [1][2][3][4][5]. Polymer dispersion liquid crystals (PDLC) have been widely used as smart windows nowadays [6].…”

Section: Introductionmentioning

confidence: 99%

P‐106: Student Poster: Highly Thermal Stable Polymer Stabilized Cholesteric Liquid Crystals Smart Window

Zhu

Liu

Seo

2022

Symp Digest of Tech Papers

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In this paper, we reported a highly thermal stable YP‐11 polymer stabilized cholesteric liquid crystal (YP‐11 PSCT) for smart windows that can be electrically switched from transparent to opaque. The polymerization between photo‐sensitive monomers (RM 257) has been characterized using a polarized optical microscope (POM), which has been found to become much firmer and denser by raising the doping concentration. The 3D polymer matrices remarkably affect the electro‐optical performances of YP‐11 PSCT, and the cholesteric liquid crystals (Ch LCs) within polymer matrices were found merely able to be reversibly switched until the doping concentration of RM 257 was raised up to 3%. Specifically, the threshold voltage, raising time and decaying time of a 3% YP‐11 PSCT cell were determined as 22.908 V, 85.442 ms and 18.617 ms, respectively. The critical thermal‐stable temperature of the 3% YP‐11 PSCT was further evaluated using a hot stage and was confirmed as high as up to 100 °C. These findings in this paper will significantly contribute to the development of smart windows.

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Dual-Mode Switchable Liquid-Crystal Window

Cited by 16 publications

References 49 publications

Multifunctional Liquid Crystal Smart Glass with Light Field Shaping, Dimming, and Scattering Control

Multifunctional Liquid Crystal Smart Glass with Light Field Shaping, Dimming, and Scattering Control

Controlling the Pretilt Angles of Guest–Host Liquid Crystals via a Hydrophilic Polyimide Layer through Oxygen Plasma Treatment

P‐106: Student Poster: Highly Thermal Stable Polymer Stabilized Cholesteric Liquid Crystals Smart Window

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