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In most systems, heating accelerates non\u2010radiative decay, leading to monotonic weakening and loss of phosphorescence. High\u2010temperature tolerance, tunable color, and heating\u2010activated emission are seldom combined in one system. A triphenylamine derivative is doped into a calcium polyacrylate matrix to construct a material in which heating activates phosphorescence. The hydrated network shows no phosphorescence at room temperature. Heating induces a phase separation that initiates and intensifies the emission, which is opposite to typical thermal quenching. Continued heating removes water and locks the rigid microenvironment, yielding a phosphorescent xerogel. In this xerogel, emission is reversibly tuned from 505\u00a0nm to 450\u00a0nm, a visible afterglow persists to 473\u00a0K, and a lifetime of about 9\u00a0ms remains detectable at 573\u00a0K. Mechanistic studies attribute this behavior to multi\u2010force synergy within the matrix: hydrogen bonding provides baseline rigidity for triplet stabilization, Ca\n                    <jats:sup>2+<\/jats:sup>\n                    \u2013COO\n                    <jats:sup>\u2212<\/jats:sup>\n                    coordination imparts thermal stability and triggers phase separation, and the resulting phase\u2010separated domains form the confined microenvironment responsible for phosphorescence. These results demonstrate that thermally induced phase separation can build molecular rigidity on demand, so that heat acts as an activator rather than a quencher of phosphorescence.\n                  <\/jats:p>","DOI":"10.1002\/anie.3918331","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T04:28:51Z","timestamp":1791520131000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Gel Displays Heating\u2010Activated Wavelength\u2010Tunable High\u2010Temperature Phosphorescence"],"prefix":"10.1002","author":[{"given":"Yufeng","family":"Huang","sequence":"first","affiliation":[{"name":"Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology  Shanghai P.R. 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