Self-Assembled Multistable Scattering Mode for Versatile Energy-Saving Smart Windows

Pravinraj Selvaraj, Wen Fa Cheng, Hsiu Ming Kuo, Cheng Kai Liu, Chao Hsuan Wu, Chung Kung Lai, Jyun Cong Lai, Sharon Tan Fang Jie, Ko Ting Cheng

Research output: Contribution to journalArticlepeer-review

Abstract

Smart windows are crucial to dynamic control over light transmission to fulfill various demands in energy saving, privacy, and information display; however, most present technologies still perform a single function (often tint or haze adjustment) and require continuous electricity for operation. In this study, novel self-assembled ionic liquid crystals (ILCs) doped with negative cholesteric liquid crystals (CLCs) to offer electrically switchable and stable scattering-mode light modulators are presented. The novel smectic A phase based on the ILCs exhibits high solubility in the adopted nematics, enhancing the LC device's performance in several ways, including improved homogeneity, stable alignment quality, prolonged stability, and simplified fabrication. The LC device can potentially offer a dynamically rapid switching function between stable transparent (imperfect fingerprint textures) states and stable scattering (focal conic textures with small domains) states by using external stimuli and highly maintained multistable states for prolonged periods, even when the external stimuli are removed. The LC device also offers polarization-independent scattering and transparent-mode LC light modulators, low operating voltage, excellent contrast, and broad viewing angles. Its versatility and outstanding field-off stability make it ideal for various applications such as smart lighting, building climate control, energy-saving displays, and augmented reality (AR) glasses.

Original languageEnglish
Article number2301001
JournalLaser and Photonics Reviews
Volume18
Issue number5
DOIs
StatePublished - May 2024

Keywords

  • cholesterics
  • dynamic scattering
  • fingerprint texture
  • ion, liquid crystal
  • low power consumption
  • multistability
  • see-through display
  • smart window

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