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Herein, a unique SQ, named as CIEE\u2010SQ, is designed to exhibit strong emission in crystal, undergoing crystallization\u2010induced reverse from dark <jats:sup>1<\/jats:sup>(n+\u03c3,\u03c0*) to bright <jats:sup>1<\/jats:sup>(\u03c0,\u03c0*) excited states. Such an excited state of CIEE\u2010SQ can be subtly tuned by molecular conformation changes during the unexpected temperature\u2010triggered single\u2010crystal to single\u2010crystal (SCSC) reversible transformation. Furthermore, co\u2010crystallization between CIEE\u2010SQ and chloroform largely stabilize the <jats:sup>1<\/jats:sup>(\u03c0,\u03c0*) state, enhancing the transition dipole moment and decreasing the reorganization energy to boost the fluorescence, which is promising in data encryption and decryption.<\/jats:p>","DOI":"10.1002\/anie.201914437","type":"journal-article","created":{"date-parts":[[2019,12,24]],"date-time":"2019-12-24T10:16:26Z","timestamp":1577182586000},"page":"10136-10142","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":78,"title":["Crystallization\u2010Induced Reversal from Dark to Bright Excited States for Construction of Solid\u2010Emission\u2010Tunable Squaraines"],"prefix":"10.1002","volume":"59","author":[{"given":"Shuaijun","family":"Yang","sequence":"first","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology  North Third Ring Road 15, Chaoyang District Beijing 100029 China"},{"name":"Institute for Smart Materials &amp; Engineering University of Jinan  No. 336 Nanxinzhuang West Road 250022 Jinan P. 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