First Chiral Catalan Solid Based on Molybdenum Halide with Efficient Circularly Polarized Luminescence in the Deep‐Red Region

tetrakis hexahedra demonstrated pronounced circularly polarized luminescence in the deep-red region, accompanied by an extended emission lifetime of 114.14 µs at room temperature. Additionally, these chiral molybdenum halide tetrakis hexahedra are optically stable for 3 months. The four-state spin sublevel model was employed to investigate the emission mechanism and found that the temperature-dependent exciton dynamics lead to the dual-band emission of the designed chiral tetrakis hexahedra. Our study expands the family of lead-free chiral metal halides and develops a novel strategy to design a high-performance deep-red CPL emitter.