As shown in Figure , the PL intensity in pure THF solution is weak, but it is significantly enhanced when the compound aggregates in 10:90 (v/v) THF/water. As a comparison, the reference compound with carbazole is also studied for its photophysical properties, which exhibit ACQ properties in the aggregate state (Figure ). These results imply that the reason for AIE property is due to having an 8π electron structure rather than the presence of a rotor. Afterwards, Chi's group reported many efficient AIE-TADF molecules based on phenothiazine . Phenoxazine is also a molecular scaffold-like phenothiazine with an 8π structure , which can also be used with permission. Copyright (2023), American Chemical Society.