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Nevertheless, the rigid planar structures and intrinsically slow reverse intersystem crossing rates (\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    ) of these materials lead to pronounced aggregation\u2010caused quenching and significant efficiency roll\u2010off. Here, we propose a sterically shielded heavy\u2010atom strategy that simultaneously suppresses detrimental \u03c0\u2013\u03c0 stacking, accelerates\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    , and reinforces the rigidity of the conjugated framework to retain narrowband emission. The proof\u2010of\u2010concept emitters BN\u2010FLS, BN\u2010FLSe, and BN\u2010FLSSe show the green emission at 508\u2013517\u00a0nm with the narrow full width at half maximums (FWHMs) of 25\u201326\u00a0nm in solution. Notably, BN\u2010FLSSe achieves rapid\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    of 4.2 \u00d7 10\n                    <jats:sup>6<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , maintains high PLQYs above 95%, and stable emission profiles over 1\u201330 wt% broad doping range. Non\u2010sensitized OLEDs based on BN\u2010FLS, BN\u2010FLSe, and BN\u2010FLSSe show pure\u2010green electroluminescence with CIE\n                    <jats:sub>y<\/jats:sub>\n                    coordinates exceeding 0.70, high maximum external quantum efficiencies (EQE\n                    <jats:sub>max<\/jats:sub>\n                    s) of 41.7%, 41.1%, and 38.5%, and well\u2010suppressed efficiency roll\u2010offs, maintaining EQEs of 21.9%, 30.9%, and 32.7% at 1000\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , respectively. Impressively, even at high doping concentration of 30 wt%, these devices retain high EQE\n                    <jats:sub>max<\/jats:sub>\n                    s of 30.7%\u201333.1% with virtually unchanged emission spectra.\n                  <\/jats:p>","DOI":"10.1002\/anie.5721424","type":"journal-article","created":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T05:51:17Z","timestamp":1791870677000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Sterically Shielded Heavy\u2010Atom Strategy for Constructing Narrowband Pure\u2010Green MR\u2010TADF Emitters With Concentration\u2010Quenching Resistance and Fast Reverse Intersystem Crossing"],"prefix":"10.1002","author":[{"given":"Yangze","family":"Xu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Jilin University  Changchun P. R. 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