Establishment of C3-symmetric chiral doping method for widening blue phase temperature ranges

蓝光液晶有望成为下一代高响应液晶器件，拓宽蓝光液晶的温度范围对蓝光液晶的应用具有重要意义。在这项研究中，我们调查了产生稳定BP的中生元的数量及其空间排列。在以胆固醇基为取代基的一、二、三取代苯(1-6)的情况下，发现HTP与其胆固醇基的数目成正比，排列的有效性远小于胆甾基的数目。此外，诱导BP所需的手性掺杂剂的量与分子中胆固醇基团的数量成反比。在二取代苯中，间位异构体的BP温度范围比邻位异构体的BP温度范围宽。在三取代苯中，1，2，3-三取代异构体的BP温度范围比1，3，5-取代异构体的BP温度范围宽。

Blue phases (BPs) have been expected as a next high responsive liquid crystal devices, and widening a BP temperature range is important for its utilization. In this study, we performed the investigation of the number of the mesogens and their spatial arrangement for inducing stable BPs. In the cases of mono-, di-, and tri-substituted benzenes (1-6) possessing cholesteryl groups as the substituents, it was found that the HTP was proportional to the number of its cholesteryl groups and the effectiveness of the arrangement is substantially smaller than that of the number. Further, the amount of the chiral dopant necessary for inducing a BP was inverse-proportional to the number of cholesteryl groups in the molecule. In the di-substituted benzenes, the BP temperature range of the meta-isomer was wider than that of the ortho-isomer. In the tri-substituted benzenes, the BP temperature range of the 1,2,3-trisubstituted isomer was wider than that of the 1,3,5-substituted isomer.