Chiral chromophore engineered donor for constructing circularly polarized organic long-persistent luminescence exciplex.

Constructing chiral organic long-persistent luminescence materials has garnered considerable attention owing to their extraordinary ultralong emission duration but has thus far achieved limited success. Herein, we present a straightforward approach to develop chiral chromophore engineered donor for exploring chiral exciplex system, which exhibits a blue circularly polarized exciplex emission peaked at ~ 440 nm, as well as an ultralong yellow organic long-persistent luminescence from the triplet emission of chiral chromophore with emission peak at 540 nm and ultralong duration of 90 minutes. Particularly, the exciplex system achieves mirror-symmetric chiroptical signal with the dissymmetry factor of 7.8×10-3. Theoretical and experimental analyses reveal that the phenomenon is attributed to the charge transfer process that facilitates exciplex formation, followed by effective energy transfer from the exciplex to the chiral chromophore. The developed exciplex enables the applications of multi-level information encryption and three-dimensional display objects. This work presents a significant insight into advancing organic chiral afterglow materials with ultralong duration, unlocking broad application potentials across various domains.