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Electrically Switchable, Hyper‐Reflective Blue Phase Liquid Crystals Films
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2017-12-18 , DOI: 10.1002/adom.201700891 Xiaowan Xu 1 , Zhen Liu 2 , Yanjun Liu 1 , Xinhai Zhang 1 , Zhigang Zheng 2 , Dan Luo 1 , Xiaowei Sun 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2017-12-18 , DOI: 10.1002/adom.201700891 Xiaowan Xu 1 , Zhen Liu 2 , Yanjun Liu 1 , Xinhai Zhang 1 , Zhigang Zheng 2 , Dan Luo 1 , Xiaowei Sun 1
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Blue phase liquid crystals (BPLCs) with three‐dimensional periodicity have attracted significant attention due to their fast response time in the submillisecond region, which is critical in sequential liquid crystal displays and fast switchable photonic devices. However, the reflectivity of single‐layer BPLC films in the visible range, which is generally used for reflective display, is still low and limited to 50%, which hinders its use in a wide range of applications. Herein, hyper‐reflective, electrically switchable, fast responsive, and colorful reflective displays are demonstrated, which are based on multi‐layer BPLC films consisting of two single‐layer BPLC templates with opposite handedness. Hyper‐reflectivities of 89%, 82%, and 68% in the red, green, and blue color regions are achieved by refilling multi‐layer BPLC templates with achiral nematic liquid crystals. A reflectance switching of the film is achieved by unwinding the helical structure of the blue phase in an electric field, where the highest reflectance achieved in the red, green, and blue color regions is 94%, 86%, and 72%, respectively, in the presence of an electric field of 1 V µm−1. Compared to previously demonstrated BPLC films, this newly developed multi‐layer BPLC film substantially improves the overall reflection efficiency by up to 3.6 times. Our study on hyper‐reflective BPLC film provides an attractive platform for future development including sequential colorful reflective displays and switchable optoelectronic devices.
中文翻译：
电气可切换，高反射率的蓝相液晶膜
具有三维周期性的蓝相液晶（BPLC）由于其在亚毫秒级范围内的快速响应时间而受到了广泛的关注，这对于顺序显示液晶显示器和快速切换光子器件至关重要。但是，通常用于反射显示的可见光范围内的单层BPLC膜的反射率仍然很低，并限制为50％，这阻碍了它在广泛的应用中的使用。在此，展示了基于多层BPLC膜的超反射，电切换，快速响应和彩色反射显示器，该多层BPLC膜由两个具有相反手性的单层BPLC模板组成。红色，绿色，蓝色和蓝色区域是通过用非手性向列液晶填充多层BPLC模板来实现的。通过在电场中解开蓝相的螺旋结构来实现薄膜的反射率切换，其中在红色，绿色和蓝色区域中实现的最高反射率分别为94％，86％和72％，在1 V µm的电场下-1。与以前展示的BPLC膜相比，这种新开发的多层BPLC膜可将整体反射效率提高多达3.6倍。我们对超反射BPLC薄膜的研究为未来的发展提供了一个有吸引力的平台，其中包括连续的彩色反射显示器和可切换的光电设备。
更新日期：2017-12-18
中文翻译：
电气可切换，高反射率的蓝相液晶膜
具有三维周期性的蓝相液晶（BPLC）由于其在亚毫秒级范围内的快速响应时间而受到了广泛的关注，这对于顺序显示液晶显示器和快速切换光子器件至关重要。但是，通常用于反射显示的可见光范围内的单层BPLC膜的反射率仍然很低，并限制为50％，这阻碍了它在广泛的应用中的使用。在此，展示了基于多层BPLC膜的超反射，电切换，快速响应和彩色反射显示器，该多层BPLC膜由两个具有相反手性的单层BPLC模板组成。红色，绿色，蓝色和蓝色区域是通过用非手性向列液晶填充多层BPLC模板来实现的。通过在电场中解开蓝相的螺旋结构来实现薄膜的反射率切换，其中在红色，绿色和蓝色区域中实现的最高反射率分别为94％，86％和72％，在1 V µm的电场下-1。与以前展示的BPLC膜相比，这种新开发的多层BPLC膜可将整体反射效率提高多达3.6倍。我们对超反射BPLC薄膜的研究为未来的发展提供了一个有吸引力的平台，其中包括连续的彩色反射显示器和可切换的光电设备。
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