Figure 2.

Photophysical properties of PyCz under ambient conditions. (a) Steady-state PL spectra of PyCz-B and PyCz-N before (blue line) and after (red line) long photoactivation (power = 40 mW/cm², time = 10 min) under ambient conditions. (b) The phosphorescence spectra and the corresponding peak intensity at 544 nm of PyCz-B and PyCz-N after different photoactivation time ranging from 0 to 10 min by a 365 nm lamp (power = 40 mW/cm²) under ambient conditions. (c) Lifetime decay profiles of the emission peak at 544 nm of PyCz-N and PyCz-B before and after long photoactivation under ambient conditions. (d) The time-phosphorescence mapping of PyCz-B and PyCz-N for 100 min with the 365 nm light source power of 0.67 mW/cm² under ambient conditions. (e) The phosphorescence variation value (I/I₀) at 544 nm during the deactivation of the UOP for PyCz-N and PyCz-B after long photoactivation under ambient conditions. Insets: the corresponding photos at different deactivation time. (f) The corresponding dynamic lifetime τ for the photoactivation by weak 365 nm light (power = 0.67 mW/cm²) and deactivation of PyCz-B and PyCz-N under different atmosphere.