Organic Circularly Polarized Luminescence Materials in Various Aggregation States

Abstract

Circularly polarized luminescence (CPL) materials have attracted extensive attention and research in recent years. Owing to their multidimensional optical information transmission capability, an increasing number of CPL-active materials—including small molecules, aggregates, and other forms—have been applied in various optoelectronic display fields, exhibiting enormous practical potential. Among these, organic CPL materials, characterized by lower energy loss and easier designability, stand out particularly. However, the CPL properties of organic small molecules with different structures often exhibit significant variations under varying aggregation states, which stems from their intrinsic complex excited-state dynamic mechanisms. This review starts from several typical small-molecule designs, categorizes based on well-established construction strategies from predecessors, and introduces the research on the performance, regulation, and intrinsic mechanisms of CPL materials in aggregation states such as crystals, supramolecular assemblies, and polymers under different strategies in recent years. It aims to outline the current main research focuses and design concepts in the related field. Finally, we briefly analyze the challenges and opportunities faced by organic aggregated-state CPL materials.