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Herein, we disclose two DSE-active naphthalene derivatives, BNPh-Nap and BNOPh-Nap, featuring a simple D-\u03c0-A structure with an electron-accepting dimesitylboryl (BMes2) and electron-donating diphenylamino (NPh2) or N,N\u2019-di(4-methoxyphenyl)amino (NOMePh2) substituents at the 2,6-positions of the naphthalene core unit. Despite the very flat structure of the naphthalene core unit, the steric hindrance of the BMes2 and diarylamino groups can effectively suppress intermolecular \u03c0-\u03c0 interactions in the solid state. As a result, BNPh-Nap exhibits strong fluorescence not only in solution (\u03a6F = 0.97 in cyclohexane) but also in the solid state, including powder (\u03a6F = 0.67) and neat film (\u03a6F = 0.51). From BNPh-Nap to BNOPh-Nap, although the fluorescence efficiency decreases slightly in solution (\u03a6F = 0.71 in cyclohexane), the enhanced electron-donating ability of the amino group greatly boosts the solid-state fluorescence, yielding near-unity \u03a6F values in both powder (\u03a6F = 0.91) and film (\u03a6F = 0.99). These results demonstrate that simple modification of a conventional planar \u03c0-core with BMes2 and diarylamino groups enables high-performance DSE without complex twisted architectures, providing an effective strategy for developing DSE-active fluorophores.<\/jats:p>","DOI":"10.1021\/acs.joc.6c00979","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T11:02:31Z","timestamp":1790766151000},"page":"13576-13583","source":"Crossref","is-referenced-by-count":0,"title":["Dual-State Fluorescence\nwith Efficiency Close to Unity\nfrom D-\u03c0-A-Type Triarylborane-Based Naphthalenes"],"prefix":"10.1021","volume":"91","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-1687-5360","authenticated-orcid":true,"given":"Min","family":"Wang","sequence":"first","affiliation":[{"name":"Weifang University of Science and Technology , , ,","place":["Weifang, P. R. China, 262700"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meng-Qi","family":"Wu","sequence":"additional","affiliation":[{"name":"Shandong University , , ,","place":["Jinan, P. R. China, 250100"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi","family":"Fang","sequence":"additional","affiliation":[{"name":"Shandong University , , ,","place":["Jinan, P. R. China, 250100"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4077-5324","authenticated-orcid":true,"given":"Cui-Hua","family":"Zhao","sequence":"additional","affiliation":[{"name":"Shandong University , , ,","place":["Jinan, P. R. 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