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Although high\u2010order B\/N\u2010doped polycyclic aromatic hydrocarbons (PAHs) leveraging multi\u2010resonance (MR) effects show promise, their complex syntheses and large molecular weights hinder practical application. Here, we report a compact MR framework featuring three nitrogen\u2010linked boron centers, synthesized at the gram scale via a single\u2010step, amine\u2010directed borylation. This emitter displays deep\u2010blue emission with an ultra\u2010narrow full\u2010width at half\u2010maximum (FWHM) of 13\u00a0nm and achieves an order\u2010of\u2010magnitude increase in the reverse intersystem crossing rate constant (\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    ) compared to previous BN\u2010bond\u2010based blue MR emitters. Theoretical studies reveal that its \u03c0\u2010extended framework and partially distorted geometry synergistically minimize structural relaxation to reduce FWHM and enhance spin\u2013orbit coupling to facilitate efficient spin\u2010flip processes. As a result, the corresponding deep\u2010blue organic light\u2010emitting diodes exhibit an FWHM of 15\u00a0nm and a high maximum external quantum efficiency (\n                    <jats:italic>\u03b7<\/jats:italic>\n                    <jats:sub>EQE,max<\/jats:sub>\n                    ) approaching 30% at color coordinates of (0.155, 0.060), rivaling the leading performance of deep\u2010blue OLEDs based on conventional B\/N\u2010doped frameworks.\n                  <\/jats:p>","DOI":"10.1002\/anie.202503320","type":"journal-article","created":{"date-parts":[[2025,3,17]],"date-time":"2025-03-17T13:58:16Z","timestamp":1742219896000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Simple Boron\u2013Nitrogen Covalent Bond Constructs Multi\u2010Resonance TADF Emitters: Ultra\u2010Narrowband Deep\u2010Blue Electroluminescence"],"prefix":"10.1002","volume":"64","author":[{"given":"Yuxi","family":"Guo","sequence":"first","affiliation":[{"name":"Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen 518060 P.R. 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