Emergent induced circularly polarized luminescence in host–guest crystalline porous assemblies

Circularly polarized luminescence (CPL) materials have attracted extensive interests in recent years due to their promising applications in 3D displays, stereo encryptions, holography, photoelectric devices, and so on. Throughout the field, the host–guest assembly approach significantly accelerates the advancement. However, to date, no specific review has been reported about host–guest interactions and induced CPL based on crystalline porous materials (CPMs). The combination of guest units and functional supports offers excellent potential for exploring host–guest interactions and rationally designing high-efficient chiroptical composites, while CPMs have recently shown unprecedented prospects for guest immobilization. This review presents a whole picture of host–guest interaction induced CPL field, including theory and experiments, and systematically summarizes the progress about CPL of hosts (CPMs, such as metal–organic frameworks (MOFs), covalent organic frameworks (COFs), metal–organic cages (MOCs), organic cages (OCs), hydrogen-bonded organic assemblies (HOAs))-guest (chiral moieties or luminophores, such as dyes, quantum dots, complexes, up-conversion nanoparticles) assemblies. Finally, we also outline the current challenges and put forward the future perspective of this field, which are anticipated to inspire some new concept into designing the preparation and application of CPMs with CPL based on host–guest interactions.