作者:Yutaro Kogawa、Tetsu Hirose、Atsushi Yoshizawa
DOI:10.1039/c1jm13299g
日期:——
After preparing a biphenyl derivative possessing two 2,3-difluoro-1,4-diphenylbenzene units, we investigated its phase transition behaviour. It showed a phase sequence of isotropic liquid–nematic phase–anticlinic smectic C phase. A mixture with a chiral additive with a high twisting power exhibited a cubic blue phase and/or an amorphous blue phase III (BPIII). The compound doped with 10 wt% of the chiral additive showed a phase sequence of Iso 85.4 °C BPIII 70.6 °C cubic BP 47.3 °C chiral nematic 37.3 °C unidentified smectic phase. We investigated electro-optical switching in BPIII and in the cubic BP of the mixture. Transmittance without an applied electric field in the BPIII was 0%, whereas that in the cubic BP was 4.6%. Threshold and driving voltages in the BPIII are lower than in the cubic BP. Furthermore, the BPIII exhibits no voltage-induced hysteresis effects on transmittance. Amorphous BPIII has superior potential for use in next-generation displays.
在制备出具有两个 2,3-二氟-1,4-二苯基苯单元的联苯衍生物后,我们对其相变行为进行了研究。它呈现出各向同性液相-向列型相-抗折射共晶 C 相的相序。含有高扭曲力手性添加剂的混合物显示出立方蓝相和/或无定形蓝相 III(BPIII)。掺杂了 10 wt%手性添加剂的化合物显示出 Iso 85.4 ℃ BPIII 70.6 ℃ 立方 BP 47.3 ℃ 手性向列相 37.3 ℃ 未识别的共晶相的相序。我们研究了混合物中 BPIII 和立方 BP 的电光转换。在没有外加电场的情况下,BPIII 的透射率为 0%,而立方 BP 的透射率为 4.6%。BPIII 的阈值电压和驱动电压均低于立方体 BP。此外,BPIII 在透射率上没有电压引起的滞后效应。非晶 BPIII 具有在下一代显示器中使用的巨大潜力。