Fig. 5: Proposed mechanism of blue-to-NIR CL in amine-initiated polyesters.
From: Enabling nonconjugated polyesters emit full-spectrum fluorescence from blue to near-infrared

Amine-initiated polyesters with diverse microstructures make it easier to form various amine-ester complexes to induce red-to-NIR CL. Blue and dark-green balls represent ester units and amines, respectively. Blue, pink and red light around aggregates of balls represent the emission color of isolated ester groups, short-range and long-range complexes, respectively.