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

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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.