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Adv."],"published-print":{"date-parts":[[2026,4,10]]},"abstract":"<jats:p>\n                    Covalent organic frameworks (COFs) are promising platforms for smart photoluminescent (PL) materials, but their emission is often quenched by \u03c0-\u03c0 stacking\u2013induced nonradiative transitions. Here, we use a pressure-treatment strategy on a series of sterically engineered pyrene-based imine COFs\u2014Py-Da-COF, Py-Da-2CH\n                    <jats:sub>3<\/jats:sub>\n                    -COF, and Py-Da-4CH\n                    <jats:sub>3<\/jats:sub>\n                    -COF\u2014to achieve steric-hindrance\u2013responsive PL enhancement. Notably, the pressure-treated Py-Da-4CH\n                    <jats:sub>3<\/jats:sub>\n                    -COF exhibits an increase in PL quantum yield, reaching a record-high value of 91.5% from the initial 14.7%. Experimental and theoretical analyses reveal that the bulky methyl substituents elevate the phase transition barrier, locking the COF into an irreversible a quasi\u2013AB stacking configuration. This structural rearrangement suppresses \u03c0-\u03c0 interactions and restricts carbon-hydrogen vibrations, minimizing nonradiative decay. Our work establishes a generalizable approach to designing high-performance PL COFs for practical optoelectronic applications.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aeb5242","type":"journal-article","created":{"date-parts":[[2026,4,10]],"date-time":"2026-04-10T18:01:06Z","timestamp":1775844066000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":2,"title":["Pressure-driven steric hindrance engineering for maximizing photoluminescence in covalent organic frameworks"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-5755-7704","authenticated-orcid":true,"given":"Yixuan","family":"Wang","sequence":"first","affiliation":[{"name":"Synergetic Extreme Condition High-Pressure Science Center, State Key Laboratory of High Pressure and Superhard Materials, College of Physics, Jilin University, Changchun 130012, 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