A stable and scalable polymer-stabilized liquid crystal window which electrically switches from transparent to opaque has been fabricated. Scanning electron microscope measurement shows that higher polymer concentration will induce denser polymer network in polymer stabilized liquid crystal system and then stronger anchoring force between polymer network and liquid crystal molecules, which resulting in larger operating voltage. The cell with larger cell gap has a lower saturated transmittance in the voltage-on state, which attributed to a larger number of scattering domains in thick cell. The optimized cell exhibits a highly transparent voltage-off state (3.5% haze) and a voltage-on scattering state (98% haze) with the threshold voltage of around 20 V. The durability test shows that the optical device switches at least 100,000 times without degradation of optical contrast and shows a high temperature tolerance. Meanwhile, a 40 × 50 cm2 window has been developed in an industrial production line showing the same optical properties. Our results demonstrate the fabrication of smart windows with a highly transparent rest state and high optical contrast on a commercial mass production scale, making them attractive for applications in buildings, automobiles, and switchable sunglasses for light management and potentially energy saving.
National Natural Science Foundation of China (51503070, 51711530651, 51603069, and 51561135014); Science and technology project of Guangdong Province (2018A050501012 and 2017B020240002); Program for Chang Jiang Scholars and Innovative Research Teams in Universities (IRT_17R40); Guangdong Innovative Research Team Program (2013C102); Guangdong Provincial Key Laboratory of Optical Information Materials and Technology (2017B030301007); and the 111 Project and Yunnan Expert Workstation (2017IC011).
|111 Project and Yunnan Expert Workstation
|Guangdong Provincial Key Laboratory of Optical Information Materials and Technology
|Program for Changjiang Scholars and Innovative Research Teams in Universities
|Guangdong Province Introduction of Innovative R&D Team
|National Natural Science Foundation of China
|51503070, 51603069, 51711530651, 51561135014
|Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology
|Science and Technology Planning Project of Guangdong Province
- liquid crystals
- optical properties