Figure 1.

The structure of PyCz and two kinds of crystal of PyCz with different photoactivation UOP speed. (a) Molecular structure of PyCz with two kinds of molecular packing mode. Insets: the fluorescence microscopy images of PyCz-B and PyCz-N with the scale bar of 200 μm. (b) The afterglow photos of PyCz-B and PyCz-N at different photoactivation time with a handheld 365 nm UV lamp (40 mW/cm²) under ambient conditions, and the dashed circles are used to distinguish the samples with low afterglow intensity.