Abstract
Photochromic diarylethenes that are reversibly isomerized by visible and ultraviolet light irradiation could be had the potential to be utilized in a variety of functional devices and systems. In this study, we observed the autonomous formation of a sharp, nanometer-scale boundary between two different surface morphology of photochromic diarylethene crystals when both visible and ultraviolet light were irradiated. We developed a theoretical model using catastrophe theory, which agrees with our experimental observations. This study not only reveals a fundamental experimental finding regarding photochromic crystals but also provides interesting resources to be utilized for future natural intelligent devices and systems.
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