Fig. 5
The photo-induced phosphorescence property of CS-CF3. a The room temperature phosphorescence spectra of CS-CF3 crystal before and after 365 nm UV irradiation for 3 min. b The UV–visible spectra of the CS-CF3 crystal before and after UV irradiation for 5 min. c Time-resolved PL-decay curves for the room temperature phosphorescence of CS-CF3 crystal under 5 min 365 nm UV irradiation and after 1 or 2 or 4 h of standing at 77 K or 298 K. d The crystal structures of coupled CS-CF3 before and after UV irradiation for 5 min. e Double security protection applications by using three kinds of components of CS-CF3, CS-F and (4-methoxyphenyl)(phenyl)methanone. Under 365 nm UV irradiation, it presents blue pattern 8; then switching off the UV light suddenly, it turns to green pattern 7; if the UV irradiation could be kept for about 5 min, it would appear green pattern 9 after turning off the UV light
