文献类型：期刊文献

英文题名：Room temperature stable helical blue phase enabled by a photo-polymerizable bent-shaped material

作者：Yang, Wei-Qiang[1];Cai, Guo-Qing[1];Liu, Zhen[1];Wang, Xiao-Qian[1];Feng, Wei[2];Feng, Yiyu[2];Shen, Dong[1];Zheng, Zhi-gang[1,3]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China;[3]Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA

年份：2017

卷号：5

期号：3

起止页码：690

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20170403279692);WOS:【SCI-EXPANDED(收录号:WOS:000394577000024)】；

基金：This work is sponsored by the National Science Foundation of China (No. 61435008, 61575063, 51633007, 51425306).

语种：英文

外文关键词：Crosslinking - Electric fields - Nematic liquid crystals

摘要：A carefully designed polymerizable achiral bent-shaped material was synthesized and homogeneously mixed with a chiral nematic liquid crystal host to form a stable self-organized three-dimensional blue phase liquid crystal nanostructure. Distinguishable from the polymer stabilization commonly used for widening the temperature range, such a bent-shaped dopant possesses two-fold effects. On one hand, a wide blue phase range can be readily induced from a chiral nematic phase due to the unique bent-shaped geometry; on the other hand, the blue phase range can be widened further through subsequent photo-crosslinking owing to two polymerizable acrylate terminal groups. A blue phase with a 58 degrees C range, including the whole room temperature range, was achieved. Moreover, stability under an applied electric-field, which is unachievable for common bent-shaped material induced blue phases, was achieved. The results showed a sub-millisecond response time, which is comparable with normal blue phase liquid crystals, and what is more, hysteresis of the voltage dependent transmittance performance was suppressed. An almost hysteresis-free electro-optical performance, accompanied by a fast responsiveness, is preferable for display and other applications. This work developed another kind of stable blue phase liquid crystal with a satisfying thermal and electro-optical performance, thereby facilitating its perspective applications.