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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Dual-Function Smart Windows Using Polymer Stabilized Cholesteric Liquid Crystal Driven with Interdigitated

Xiaoyu Jin¹, Yuning Hao¹, Zhuo Su²

¹College of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China.

|April 13, 2023

Summary

This summary is machine-generated.

This study introduces an electrically switchable window using polymer stabilized cholesteric liquid crystals (PSCLCs). It dynamically controls visible light transmission and infrared light reflection for smart light and heat management.

Keywords:

cholesteric liquid crystal interdigitated electrodes reflection bandwidth smart window transmittance

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Area of Science:

Materials Science
Optoelectronics
Applied Physics

Background:

Smart windows offer dynamic control over light and heat transmission.
Existing smart window technologies have limitations in simultaneously managing visible and infrared light.

Purpose of the Study:

To develop an electrically switchable window capable of dynamically controlling both visible light transmittance and infrared (IR) light reflection.
To investigate the use of polymer stabilized cholesteric liquid crystals (PSCLCs) for this application.

Main Methods:

Fabrication of a window device using PSCLCs sandwiched between patterned electrode substrates.
Application of vertical alternating current (AC) electric fields to modulate visible light transmittance.
Application of in-plane interdigital direct current (DC) electric fields to tune IR reflection bandwidth.

Main Results:

Visible light transmittance was reduced from 90% to less than 15% by switching CLC texture to a scattering focal conic state.
IR reflection bandwidth was dynamically adjustable from 158 nm to 478 nm by controlling helix pitch distortion.
Both visible transmittance and IR reflection bandwidth were tunable via electric field strength and reversible upon field removal.

Conclusions:

The developed PSCLC-based window offers on-demand control over both visible light and IR radiation.
This technology presents a promising solution for advanced indoor light and heat management.
Potential applications include energy-efficient green buildings and automotive windows.