Fig. 3. (a) PL spectra of BFBDTE in toluene measured under prompt and delayed mode at room temperature (λex = 450 nm). (b) Delayed fluorescence spectra of BFBDTE in toluene measured in the temperature range of 77 to 300 K. Prompt fluorescence spectra (c) and decay curves (d) of BFBDTE in toluene upon irradiation with green light (530 nm). The insets show the reversible fluorescence switching upon alternating irradiation with green and NIR (770 nm) light. Delayed fluorescence spectra (e) and decay curves (f) of BFBDTE in toluene upon irradiation with green light (530 nm).
