Polymorphic Organic Microcrystals for Multi-Color Circularly Polarized Laser Emission

Circularly polarized lasers play important roles in chiroptical technologies. Organic materials have the potential for exploring multi-color circularly polarized laser emission owing to their large diversity. However, the realization of multi-color organic circularly polarized lasing generally requires sophisticated molecular design and time-consuming synthesis. Here, we propose a crystal polymorphism strategy to realize multi-color circularly polarized lasing. Three kinds of polymorphic microcrystals are synthesized from one organic compound by controlling the liquid-phase molecular self-assembly. The polymorphic microcrystals combine the cavity effect with multi-color optical gain and chiroptical activity, which enable violet-blue, blue, and cyan circularly polarized laser emission. This work establishes an organic polymorphic material platform for exploring multi-color circularly polarized lasers.