Effective electrically tunable infrared reflectors based on polymer stabilised cholesteric liquid crystals |
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| Authors: | Xiaowen Hu Weijie Zeng Wenmin Yang Longqiang Xiao Laurens T. De Haan Wei Zhao |
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| Affiliation: | 1. SCNU-TUE Joint Laboratory of Device Integrated Responsive Materials (DIRM), National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou, P.R. China;2. South China Academy of Advanced Optoelectronics, Institute of Electronic Paper Displays and Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, P.R. China;3. South China Academy of Advanced Optoelectronics, Institute of Electronic Paper Displays and Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, P.R. China |
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| Abstract: | Electrically tunable infrared (IR) reflectors based on polymer stabilised cholesteric liquid crystals (PSCLC) have been fabricated. The influence of polymerisation time on bandwidth broadening and response time of the IR reflector was investigated. Such IR reflector can reflect broad band of infrared light from 725 to 1435 nm upon application of a DC electric field, while remaining predominantly transparent in the visible region, with the transmittance in the region of 400–700 nm being above 90%. Bandwidth broadening was induced using low operational power with acceptable switching speeds. Model tests reveal that this IR reflector can effectively control the indoor temperature. The distinct properties of such IR reflector make it a good candidate for smart windows of automobiles and buildings to control interior temperature and save energy. |
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| Keywords: | Cholesteric liquid crystals polymer network electric regulation infrared reflectors energy saving |
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