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However, they frequently suffer from severe deactivation under extreme conditions (aqueous environment and high temperature) and rely exclusively on ultraviolet (UV) excitation, which greatly limits their reliability and utility. Herein, we present an efficient supramolecular assembly strategy to achieve visible light\u2010activated organic phosphorescence under extreme environments, including various aqueous media (acidic, alkaline, oxidizing, or reducing solutions) and high temperature. AC@AMD is constructed via hydrogen bonds and covalent interactions between aromatic acid (AC) and ammelide (AMD), providing a rigid microenvironment. This structure effectively reduces the singlet\u2013triplet energy gap (\u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    ) and enhances spin\u2013orbit coupling (SOC), endowing AC@AMD with efficient RTP: phosphorescence quantum yield (\n                    <jats:italic>\u03a6<\/jats:italic>\n                    <jats:sub>P<\/jats:sub>\n                    ) up to 34.31% and lifetime (\n                    <jats:italic>\u03c4<\/jats:italic>\n                    <jats:sub>P<\/jats:sub>\n                    ) of 1094.99\u00a0ms. Moreover, the formation of hydrogen\u2010bonding networks further enhanced the rigidity of AC@AMD, making them with the excellent phosphorescence features in aqueous solutions. More importantly, the compact lamellar structure and the strong stability of the matrix skeleton structure of AC@AMD due to the presence of abundant N\u2500C\u2550N and N\u2500C\u2550O bonds endow them with excellent tolerance to various extreme aqueous solutions and high temperature. In view of the above\u2010mentioned advantages, information encryption, anti\u2010counterfeiting labeling, and bioimaging applications are demonstrated.\n                  <\/jats:p>","DOI":"10.1002\/smll.74419","type":"journal-article","created":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T16:21:38Z","timestamp":1783354898000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Visible\u2010Light\u2010Activated Multi\u2010Color Room Temperature Phosphorescence Under Extreme Aqueous Environment and High Temperature via Supramolecular Assembly"],"prefix":"10.1002","volume":"22","author":[{"given":"Hongpu","family":"Xin","sequence":"first","affiliation":[{"name":"Tianjin Key Laboratory of Chemical Process Safety Hebei Key Laboratory of Functional Polymers School of Chemical Engineering and Technology Hebei University of Technology  Tianjin P. R. 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