Highly Efficient Circularly Polarized Phosphorescence from Isolated Molecules Through Intermolecular Interactions.

Organic room-temperature phosphorescence with circularly polarization feature attracts considerable attentions owing to its unique exciton and photon properties. However, achieving high-efficiency circularly polarized phosphorescence (CPP) under ambient conditions remains a major challenge. Herein, we report a series of CPP films by doping heterocyclic molecules with a chiral propionic acid group into polyvinyl alcohol (PVA) matrix, achieving a maximum phosphorescence efficiency of 68.4% under ambient conditions. The intermolecular interactions between the chiral isolated molecules and PVA simultaneously induce circularly polarized luminescence and enhance phosphorescence efficiency, thereby improving CPP performance. Moreover, the CPP lifetimes of the films can be rationally tuned from 1 to 944 ms by subtle modification of heteroatoms on the heterocyclic chromophores. This study provides a promising approach to developing efficient CPP materials for potential applications in optoelectronics and bioelectronics.