However, owing to constraints in computational chemistry during that era, Leung's approach to elucidating the RIV mechanism encountered certain limitations. With advancements in quantum chemistry and further enhancements to theoretical calculation tools, more comprehensive theoretical explanations were proposed. Zheng et al. utilized the CIs mechanism to demonstrate that, during photoexcitation, the central olefin double bond undergoes opening and rotation, implying the presence of rotor structures in BDBA and THBDBA . The mutual restraint between the barrier to reaching the conical intersection and the non-radiative decay pathway leads to the AIE behavior of the molecule. The CI mechanism offers a more quantum-based theoretical foundation for understanding TPE's aggregation-induced emission mechanism , distinct from the classical mechanics mechanism of AIE.