Piecewise Phototuning of Self-Organized Helical Superstructures
Piecewise Phototuning of Self-Organized Helical Superstructures
复制标题
自组织螺旋上部结构的分段光调谐
DOI：
10.1002/adma.201704941
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发表时间：
2018-02-22
影响因子：
29.4
通讯作者：
Yu, Yanlei
中科院分区：
文献类型：
--
作者：
Qin, Lang;Gu, Wei;Yu, Yanlei
胆甾相液晶（CLC）具有选择性反射，由于内在的自组织螺旋超结构的动态控制，可以进行调谐。虽然报道了光可调谐反射，但这些系统迄今为止受到限制，因为调谐范围被限制在一个窄周期内，并且光学寻址的图像必须牺牲可见光谱中的一种颜色来充当背景，这是由于现有的光响应手性开关的螺旋扭曲功率的变化不足造成的。在这里，三原色的红色，绿色，蓝色（RGB）与黑色背景的微妙的图案，这是实现基于分段反射调谐的CLC诱导的一种新设计的光响应三稳态手性开关。手性开关的三种稳定构型赋予了CLC两个连续相邻的反射调谐周期，不仅覆盖了整个可见光谱，而且在近红外区域内还多了一个较宽的周期。因此，CLC系统中的分段调谐概念为光调谐RGB和黑色反射显示提供了一种新的策略。
Cholesteric liquid crystals (CLCs) exhibit selective reflection that can be tuned owing to the dynamic control of inherent self-organized helical superstructures. Although phototunable reflection is reported, these systems hitherto suffer from a limitation in that the tuning range is restricted to one narrow period and the optically addressed images have to sacrifice one color in the visible spectrum to serve as the background, resulting from the insufficient variation in helical twisting power of existing photoresponsive chiral switches that are all bistable. Here, delicate patterns of three primary red, green, and blue (RGB) colors with a black background are presented, which is realized based on piecewise reflection tuning of the CLC induced by a newly designed photoresponsive tristable chiral switch. Three stable configurations of the chiral switch endow the CLC with two continuous and adjacent tuning periods of the reflection, covering not only entire visible spectrum, but also one more wide period within near-infrared region. Therefore, the concept of piecewise tuning in CLC system demonstrates a new strategy for phototunable RGB and black reflective display.