文献类型：期刊文献

英文题名：Photoinduced phase transition behaviours of the liquid crystal blue phase doped with azobenzene bent-shaped molecules

作者：Wen, Ying[1,2];Zheng, Zhigang[1];Wang, Haifeng[1];Shen, Dong[1]

机构：[1]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：39

期号：4

起止页码：509

外文期刊名：LIQUID CRYSTALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000302150800014)】；

基金：This work was supported by the National Science Foundation of China (grant No. 61108065) and the Fundamental Research Funds for the Central Universities (grant No. WM1014015).

语种：英文

外文关键词：blue phase; liquid crystal; photoisomerisation

摘要：A kind of azobenzene-based bent-shaped molecule is doped into a chiral nematic liquid crystal, so as to induce a 25 degrees C blue phase range. As the sample is irradiated by 365 nm ultraviolet radiation, phase transitions from the blue phase to the chiral nematic, and then to the isotropic state are observed, because of the trans-cis isomerisation of the azobenzene moiety; on the other hand, the cis-trans isomerisation of azobenzene leads to the recovery from the isotropic to the blue phase. The transition time from the blue phase to the isotropic is about similar to 1-2 minutes, and the time for the recovery is about 2 hours; these times are significantly faster than that of conventional materials. It is also found that the transition time from the blue phase to the isotropic is extended with increase of the material thickness and the weakening of ultraviolet intensity; however, no distinct effects on the time of the reverse process are seen. In addition, a stripe pattern is fabricated by photomask exposure, and such results indicate prospects for application of this material in light-driven displays and information storage.