Effect of blue-phase liquid crystals on the fluorescence properties of aggregation-induced emissive molecules

In order to broaden the application of bluephase liquid crystal (BPLC? and build a multifunctional BPLC system platform? this paper introduces TPE-PPE? a liquid crystal with aggregation-inducedemission(AIE?characteristics? into the BPLC system? and carries out a study on the fluorescence performance of the composite system. On the one hand? the effects of chiral dopant content on the phase transition behavior and photonic band gap (PBG? displacement of the BPLC are systematically investigated and summarized. On the other hand? the influence of BPLC on the fluorescence performance of AIE molecules is explored? and relevant fluorescence enhancement effects are proposed. The experimental results show that the temperature domain ranges of blue phase II with different chiral dopants systems are basically the same? and the PBG shows blue shift with decreasing temperature. The temperature range of blue phase I is closely related to the chirality? and when only blue phase I exists in the system? its PBG shows red shift with the decrease of temperature. The BPLC system has a certain fluorescence enhancement effect on AIE molecules? and the fluorescence intensity of the system is obviously enhanced with the red shift of the PBG of blue phase I. It is concluded that the TPE-PPE molecules are involved in the self-assembly of the BPLC system to a certain extent.The enhanced fluorescence intensity of the TPE-PPE molecules is due to the restricted movement of the TPE-PPE molecules in the double-twisted cylinders.With the disappearance of the blue phase II and the red shift of the PBG of the blue phase I?more TPE-PPE molecules are involved in the self-assembly of the double-twisted cylinders? and the fluorescence emission of the system is enhanced.