, a structural motif characteristic of low-dimensional organic-inorganic perovskite-like materials. Upon light irradiation, efficient photoinduced electron transfer enables rapid photochromism, with coloration occurring within 10 s and complete thermal decoloration achieved at 160°C within 10 min, supporting robust photo-writing/erasing cycles. Importantly, the photochromic response remains operable directly in water, enabling aqueous information writing and on-demand thermal erasing. This work provides a viable materials design strategy to address the challenge of water-stable and water-operable photochromic systems, enabling underwater information writing, wet-environment anti-counterfeiting, and rewritable displays.
Hu et al. (Sun,) studied this question.