Jie Yang, Xuming Gao, Zongliang Xie, Yanbin Gong, Manman Fang, Qian Peng, Zhenguo Chi, Zhen Li*, Angew. Chem. Int. Ed. 2017, DOI: 10.1002/anie.201708119
Two stable, purely organic luminogens exhibit both mechano- (ML) and photoluminescence (PL) with dual fluorescence–phosphorescence emissions at room temperature. Careful analysis of the crystal structures, coupled with theoretical calculations, demonstrate that room-temperature phosphorescence and ML properties are strongly related to molecular packing. In particular, the formation and fracture of molecular dimers with intermolecular charge-transfer properties has a significant effect on intersystem crossing, as well as excited triplet state emissions, in both PL and ML processes.
Keywords: Excited-state emissions, Mechanoluminescence, Room-temperature phosphorescence, Stimuli response