Mechanically Controlled and Consecutively Boosted Circularly Polarized Luminescence of Nanoassemblies from Achiral Molecules

Consecutively boosted circularly polarized luminescence (CPL) with controlled handedness has been demonstrated in a supramolecular assembly from a completely achiral molecule. It is found that achiral C-3 symmetric molecules exhibit strong supramolecular chirality as well as CPL through a vortex-accompanied assembly method. Surprisingly, the remarkable chiroptical property and the excited energy of the achiral molecules can be further transferred to another achiral dye, resulting in an amplified CPL with a dissymmetry factor over 0.1. This work not only provides a scenario for realizing the emergence, amplification, and transfer of CPL in the supramolecular system from achiral molecules, but also paves an easy yet efficient way to construct a strong and tunable circularly polarized emission based on the coupling with achiral fluorophores.