Yanfeng He,‡ Caihong Mao,‡ Mingwan Duan, Linmeng Fan, Xiaohan Wang, Yan Cai, Min Du, Minli Hu, Ping Hu, Qiuyu Cheng and Xiaobo Hu *，Rescuing the solid-state fluorescence of perylene diimide dyes by host–guest isolation，Org. Chem. Front., 2022, 9, 6466