ABSTRACT The aggregation of pyrene derivatives often causes fluorescence quenching (aggregation‐caused quenching, ACQ), constraining their applications in photonics. Nevertheless, the optical properties of pyrene‐based materials can be effectively modulated through strategic molecular design and external pressure. Herein, we report a high‐pressure study on 1,6‐dibromopyrene (1,6‐DBrPy), which has a long‐range ordered stacking structure. The emission intensity of 1,6‐DBrPy increases with pressure over the range of 0.5 to 3.6 GPa. This enhancement stems from the pressure‐induced reorganization of the molecular packing, which promotes the formation of Br···Br interactions. These interactions reinforce the structural rigidity of the assembly, thereby effectively suppressing molecular vibrations and reducing non‐radiative decay, ultimately leading to improved luminescence performance. Such crystals with emission enhancement behavior possess great potential for optoelectronic applications and provide a new perspective for understanding the photophysical behavior of complex molecular aggregation systems.
Wang et al. (Thu,) studied this question.