Fig. 1

The room temperature phosphorescence (RTP) behavior of the six target compounds. The molecular structures of the six compounds of CS-CH3O, CS-CH3, CS-H, CS-Br, CS-Cl, and CS-F, and their corresponding phosphorescence lifetimes in crystals at room temperature (RT). The photographs were taken at different times, before and after turning off the 365 nm UV irritation under ambient conditions