Advanced electro-optical smart window based on PSLC using a photoconductive TiOPc electrode

Fuh, Andy Ying–Guey; Chih, Shang Yi; Wu, Shu‐Chen

doi:10.1080/02678292.2017.1397214

Cited by 21 publications

(9 citation statements)

References 28 publications

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“…5 wt %). Although the reverse-mode PSLC films with a small amount of polymer materials show high transmittance at the transparent state, low driving voltage, and fast response time, − the films usually have sparse polymer networks, which are too fragile to resist the damage caused by multiple cycles of electrical power . The low stability of the electro-optical property limits its further application in smart cars and buildings.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Highly Durable Reverse-Mode Polymer-Stabilized Liquid Crystal Films with Polymer Walls

Ren

et al. 2022

ACS Appl. Mater. Interfaces

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Reverse-mode polymer-stabilized liquid crystal (PSLC) films have wide applications in smart windows for cars as well as buildings and dimming glasses due to their low haze, low energy consumption, and better safety in case of emergency power off. However, PSLC films usually have poor stability of electro-optical properties due to their low polymer content (ca. 5 wt %), and it still remains a challenging task to improve the stability and processability by increasing the polymer content in PSLC as the driving voltage might dramatically increase. In this work, a reverse-mode PSLC film with polymer walls was prepared, which showed excellent stability of electro-optical properties even after 150 000 cycles. The film was prepared through polymerization with a photomask, in which the monomers concentrated on specific areas to form patterned polymer walls. In this way, the polymer content could be increased dramatically and the anchoring effect would not be too strong, thus avoiding a sharp increase in the driving voltage. As a result, the desired reverse-mode film with high stability, relatively low driving voltage, and high contrast ratio was obtained. The effects of monomer compositions, curing temperature, UV light intensity, and the pattern of the photomask on the microstructures, as well as electro-optical performances of the films were carefully studied. This work provides a new idea for the preparation of reverse-mode electrically switchable light-transmittance controllable films with excellent stability and good electro-optical performance, which would broaden their application in smart cars, building windows, and dimming glasses for light management and potential energy saving.

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Section: Introductionmentioning

confidence: 99%

Preparation of Highly Durable Reverse-Mode Polymer-Stabilized Liquid Crystal Films with Polymer Walls

Ren

et al. 2022

ACS Appl. Mater. Interfaces

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“…Liquid crystals (LC) have been particularly popular as the functional material used in smart window technologies because their optical characteristics can be altered either using applied electric fields or remotely using photo‐illumination. The LC films that are typically employed often belong to one of the following classes: polymer stabilized LCs (PSLC), [ 6 ] polymer dispersed LC (PDLC), [ 7 ] or chiral nematic LC (CLC). [ 8 ] Each of these systems can give rise to a light scattering state or a transparent state depending upon the material combination, device architecture, and electric field conditions.…”

Section: Introductionmentioning

confidence: 99%

Printed Polymer‐Stabilized Chiral Nematic Liquid Crystal Privacy Windows

Kamal

Orr

et al. 2022

Macro Chemistry & Physics

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In this paper, drop-on-demand (DoD) printing is demonstrated of polymer stabilized chiral nematic liquid crystal (PSCLC) privacy windows that can function in either a conventional mode (scattering to transparent) or reverse mode (transparent to scattering) with the application of an electric field. Inkjet printed droplets of the PSCLC mixture, with diameters of the order of 100-200 μm and sandwiched in LC layer thicknesses of ≈10-15 μm, are characterized in terms of their transmission as a function of the electric field amplitude and the response times for switching into and out of the scattering state. The results show that the printed droplets, and arrays thereof, exhibit similar electro-optical properties to analogous thin-film devices, but with the ability to incorporate bespoke features such as images and decorative patterns. Finally, the electro-optical switching of a printed PSCLC privacy window whereby alphanumeric characters can be made to appear and disappear with the application of an electric field is demonstrated.

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“…In one voltage condition, the windows are transparent with high transmittance. In another voltage condition, they are optically scattering (Long and Ye, 2014;Fuh et al, 2017;Jiang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal-polymer composites switchable windows for radiant energy flow and privacy control

Halder

Shin

Zhou

et al. 2022

Front. Soft. Matter

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Global warming is becoming a more and more severe crisis for humans. One way to resolve the concern is to reduce energy consumption. Smart switchable windows for office and residential buildings and vehicles can help reduce energy consumption. An ideal smart window should be able to control radiant energy flow and privacy. We investigated the capability of switchable windows based on liquid crystal/polymer composites, such as polymer dispersed liquid crystal (PDLC), polymer stabilized liquid crystal (PSLC), and polymer stabilized cholesteric texture (PSCT), to control the privacy and radiant energy flow. Through a systematic study, we identified methods to improve their capabilities. We demonstrated that PDLC and PSCT windows of sufficient thick film thickness can control both privacy and energy flow.

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Advanced electro-optical smart window based on PSLC using a photoconductive TiOPc electrode

Cited by 21 publications

References 28 publications

Preparation of Highly Durable Reverse-Mode Polymer-Stabilized Liquid Crystal Films with Polymer Walls

Preparation of Highly Durable Reverse-Mode Polymer-Stabilized Liquid Crystal Films with Polymer Walls

Printed Polymer‐Stabilized Chiral Nematic Liquid Crystal Privacy Windows

Liquid crystal-polymer composites switchable windows for radiant energy flow and privacy control

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