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However, studies on pressure\u2010induced fluorescence enhancement in pyrene\u2010centered systems have been limited, and the underlying mechanism is still not well understood. By comparing the piezochromic luminescent behaviors of excimers in two pyrene derivatives, this study demonstrates that the introduction of S\u2550O bonds in Py\u2010SO crystals plays a role of notable steric hindrance, which effectively modulates molecular packing. With increasing pressure, the vibration of S\u2550O bonds is suppressed due to strengthened intermolecular interactions, which reduces non\u2010radiative transitions and enhances the fluorescence intensity of Py\u2010SO crystals notably from 0.3 to 1.4\u00a0GPa. The observed sensitive emission enhancement under low\u2010pressure conditions provides new insights into advancing the application of pyrene\u2010based materials in developing high\u2010performance luminescent devices.<\/jats:p>","DOI":"10.1002\/smll.75412","type":"journal-article","created":{"date-parts":[[2026,8,22]],"date-time":"2026-08-22T09:24:55Z","timestamp":1787390695000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Pressure\u2010Induced Excimer Emission Enhancement From 0.3\u00a0GPa to 1.4\u00a0GPa in 1\u2010((4\u2010(Tert\u2010butyl)Phenyl)Sulfinyl)Pyrene Crystals"],"prefix":"10.1002","author":[{"given":"Yuming","family":"Han","sequence":"first","affiliation":[{"name":"Department of Materials Physics and Chemistry School of Materials Science and Engineering Northeastern University  Shenyang People's Republic of 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