Responsiveness of Excited State Chirality Based on Supramolecular Assembly

Circularly polarized luminescence (CPL) as one of the optical properties of chiral materials , referring to the excited state properties of the chiral systems, has attracted much attention due to their potential applications in information encryption, high-resolution 3D displays and smart sensors. Besides the optical methods by applying a liner polarizer and a quarter waveplates, circularly polarized light could also be directly generated from chiral luminescent systems under excitation with photoluminescence or electroluminescence. Thus , a variety of CPL-active materials have been developed, including small molecular luminescence systems such as chiral organic molecules and coordination complexes , and chiral supramolecular assemblies. Self-assembly offers a powerful solution to obtaining the CPL-active materials with high quantum yields and dissymmetry factors. Responsive chiral assembled luminescent materials constructed by combining the chiral and responsive components play an important role in the development of intelligent CPL materials, reducing the tedious long synthesis process. Here, we summarize the responsive supramolecular chiroptical systems toward various stimuli, such as light irradiation, pH, solvent, temperature, mental ions, etc. This review is aimed to stimulate further academic and applied research and boost the practical applications of CPL materials in multidisciplinary fields.