Color Tuning of Perylene Based Lyotropic Chromonic Liquid Crystal

摘要

Perylene bisimides (PBIs) are widely used as dyes and pigments since they show outstanding chemical, thermal and photochemical stability. Compared to other dyes and pigments, PBIs have advantages such as better solubility, synthetic simplicity, and less trouble in purification. Beside the conventional uses, PBIs are key chromophores for high-tech applications such as reprographic processes, fluorescent solar collectors, photovoltaic cells, optical switches, and lasers, In this context, PBIs are generally referred to as functional dyes. Especially, PBIs having ionic periphery have attracted much attention because they can form lyotropic chromonic liquid crystal (LCLC) in aqueous solution. The anisotropic orientation of molecules with π-π stacking of aromatic core can exploit their intrinsic properties most efficiently in the potential applications such as coatable polarizers, oriented optical films, and biosensors. In recent years, emphasis has been given on tailoring the functional groups of PBI so that the desired optical and/or electronic properties can be achieved. In that sense and many advantages of PBI taken into account, color tuning of PBI dye is one of the key issues especially in optical and photonic applications because most of PBIs are only red or orange colored.