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Achieving pressure\u2010induced spectral narrowing in organic systems, however, remains elusive. Herein, we report the first observation of pressure\u2010driven PL spectral narrowing in ZPH crystals, a multi\u2010resonant emitter featuring B\/N\u2010skeletons and characterized by an X\u2010aggregate packing motif and strong absorption\u2010PL spectral overlap. Under hydrostatic pressure, the absorption\u2010PL spectral overlap markedly increases. This enhanced spectral overlap intensifies the self\u2010absorption effect, thereby diminishing the intensity of the main PL peak. Concurrently, below 8.93\u00a0GPa, the exciton coupling of X\u2010aggregates is slightly weakened, resulting in an enhancement of the PL shoulder peak. The opposing intensity changes of these dual peaks, attributable to the combined effects of intensified self\u2010absorption and weakened X\u2010aggregate exciton coupling, collectively lead to the observed pressure\u2010induced spectral narrowing. This work establishes a counterintuitive strategy by leveraging self\u2010absorption for spectral control, thereby advancing our understanding of how the self\u2010absorption influences photophysical properties.<\/jats:p>","DOI":"10.1002\/anie.202524841","type":"journal-article","created":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T07:00:16Z","timestamp":1765609216000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Pressure\u2010Driven Photoluminescence Spectral Narrowing in X\u2010Aggregates Dye via Self\u2010Absorption Effect"],"prefix":"10.1002","volume":"65","author":[{"given":"Yunxia","family":"Shen","sequence":"first","affiliation":[{"name":"Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry Zhejiang Normal University  Yingbin Road NO.688 Jinhua 321004 P. R. 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