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Here, we report a design strategy through peripheral fusion of heavy\u2010atom\u2010containing five\u2010membered aromatic rings into a classical multiple\u2010resonance framework BCzBN. The rigid aromatic 6\u03c0\u2010electron rings maintain planarity in both ground and excited states for small reorganization energy, which effectively suppresses structural relaxation\u2010induced spectral broadening, while simultaneously enhancing spin\u2013orbit coupling (SOC). The resulting emitters achieve narrowband pure\u2010green electroluminescence with a 27\u00a0nm full\u2010width at half\u2010maximum (FWHM) and Commission Internationale de l\u2032\u00c9clairage\n                    <jats:italic>y<\/jats:italic>\n                    \u2010coordinate of 0.72, together with a RISC rate &gt;10\n                    <jats:sup>6<\/jats:sup>\n                    s\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    . Optimized organic light\u2010emitting diode devices show a maximum external quantum efficiency (EQE) of 31.3% with negligible efficiency roll\u2010off, maintaining EQEs of 31.2% and 25.6% at 1000 and 10\u00a0000\u00a0cd m\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    , respectively. This work demonstrates the critical role of \u03c0\u2010electron counting in heavy\u2010atom integration and provides a general design principle for high\u2010performance MR\u2010TADF materials that concurrently achieve narrow emission and fast RISC kinetics.\n                  <\/jats:p>","DOI":"10.1002\/anie.202523890","type":"journal-article","created":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T06:49:57Z","timestamp":1770792597000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Heavy\u2010Atom\u2010Embedded Narrowband Multiple\u2010Resonance Thermally Activated Delayed Fluorescence Emitters With Aromaticity Guided by H\u00fcckel's and Baird's Rules"],"prefix":"10.1002","volume":"65","author":[{"given":"Chuanqin","family":"Cheng","sequence":"first","affiliation":[{"name":"Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minqiang","family":"Mai","sequence":"additional","affiliation":[{"name":"Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ke","family":"Zhao","sequence":"additional","affiliation":[{"name":"MOE Key Laboratory of Cluster Science Beijing Key Laboratory of Photoelectronic\/Electrophotonic Conversion Materials School of Chemistry and Chemical Engineering Beijing Institute of Technology  Beijing P. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haowen","family":"Li","sequence":"additional","affiliation":[{"name":"Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianping","family":"Zhou","sequence":"additional","affiliation":[{"name":"Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenglong","family":"Li","sequence":"additional","affiliation":[{"name":"Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongdong","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2750-0972","authenticated-orcid":false,"given":"Lian","family":"Duan","sequence":"additional","affiliation":[{"name":"Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University  Beijing China"},{"name":"Center For Flexible Electronics Technology Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,2,10]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202100704"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.98799"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.5c00021"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.31635\/ccschem.021.202101033"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201505491"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/D3TC00676J"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010019\u20100476\u20105"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature11687"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010021\u201000763\u20105"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201705250"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010020\u201000745\u2010z"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010024\u201001379\u20101"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1088\/1674\u20104926\/43\/11\/110202"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202306880"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1039\/D3CC05460H"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010022\u201001106\u20108"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202507626"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010022\u201001083\u2010y"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2021.131169"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202205684"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201911266"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202213392"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chempr.2024.01.018"},{"key":"e_1_2_7_25_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chempr.2024.10.020"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202511866"},{"key":"e_1_2_7_27_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.2c09543"},{"key":"e_1_2_7_28_1","doi-asserted-by":"publisher","DOI":"10.1002\/cjoc.202200356"},{"key":"e_1_2_7_29_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.2c12017"},{"key":"e_1_2_7_30_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.1c12610"},{"key":"e_1_2_7_31_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.0c05611"},{"key":"e_1_2_7_32_1","doi-asserted-by":"publisher","DOI":"10.1021\/cr300471v"},{"key":"e_1_2_7_33_1","unstructured":"Deposition Number 2487945 2487959 and 2487960 Contains the Supplementary Crystallographic Data for this Paper. 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