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Most MR\u2010TADF emitters possess relatively large \u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    and small SOC. With the goal of designing an MR\u2010TADF compound having a small \u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    and strong SOC that emits in the deep blue region, here we report a heavy atom\u2010free boron\u2010nitrogen\u2010carbonyl hybrid MR\u2010TADF emitter,\n                    <jats:bold>DDOBDiKTa<\/jats:bold>\n                    , which emits at\n                    <jats:italic>\u03bb<\/jats:italic>\n                    <jats:sub>PL<\/jats:sub>\n                    of 438\u00a0nm in toluene with a narrow full width at half maximum (FWHM) of 33\u00a0nm.\n                    <jats:bold>DDOBDiKTa<\/jats:bold>\n                    has a\n                    <jats:italic>\u03a6<\/jats:italic>\n                    <jats:sub>PL<\/jats:sub>\n                    of 70% and a \u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    of 0.05\u00a0eV in 5 wt% doped films in 26DCzPPy. Remarkably, without any heavy atoms, this emitter shows fast prompt,\n                    <jats:italic>\u03c4<\/jats:italic>\n                    <jats:sub>p<\/jats:sub>\n                    , and delayed,\n                    <jats:italic>\u03c4<\/jats:italic>\n                    <jats:sub>d<\/jats:sub>\n                    , fluorescence lifetimes of 2.3\u00a0ns and 1.48 \u00b5s, respectively, leading to a\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    of 1.98 \u00d710\n                    <jats:sup>6<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    in 26DCzPPy. This is one of the fastest\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    values among reported MR\u2010TADF emitters that have no heavy atoms. The OLED showed EQE\n                    <jats:sub>max<\/jats:sub>\n                    \/EQE\n                    <jats:sub>10000<\/jats:sub>\n                    of 23.0%\/10%, demonstrating unusually mild efficiency roll\u2010off for a blue device.\n                  <\/jats:p>","DOI":"10.1002\/anie.9957319","type":"journal-article","created":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T17:36:42Z","timestamp":1783964202000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Blue Emissive Heavy Atom\u2010Free Multiresonant Thermally Activated Delayed Fluorescent Emitter Shows Ultra\u2010Fast Reverse Intersystem Crossing"],"prefix":"10.1002","volume":"65","author":[{"given":"Wenrui","family":"Wang","sequence":"first","affiliation":[{"name":"Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hassan","family":"Hafeez","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, SUPA School of Physics and Astronomy University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sen","family":"Wu","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aidan P.","family":"McKay","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5366-9168","authenticated-orcid":false,"given":"David B.","family":"Cordes","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7821-7208","authenticated-orcid":false,"given":"Ifor D. W.","family":"Samuel","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, SUPA School of Physics and Astronomy University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7183-6022","authenticated-orcid":false,"given":"Eli","family":"Zysman\u2010Colman","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,7,13]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202402653"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.3c00755"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201506335"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.201908677"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.5c00021"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chempr.2024.10.020"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202205684"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202500683"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.26434\/chemrxiv.10001622\/v1"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/ar50001a002"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202305182"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010024\u201044981\u20101"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202301711"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202402891"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202510828"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/ange.202518419"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010019\u20100476\u20105"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202402289"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010024\u201046619\u20108"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202500010"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202502459"},{"key":"e_1_2_8_23_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202500395"},{"key":"e_1_2_8_24_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevX.14.041009"},{"key":"e_1_2_8_25_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010024\u201007149\u2010x"},{"key":"e_1_2_8_26_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201505491"},{"key":"e_1_2_8_27_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202202034"}],"container-title":["Angewandte Chemie International Edition"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/anie.9957319","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/anie.9957319","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/anie.9957319","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,14]],"date-time":"2026-09-14T09:10:37Z","timestamp":1789377037000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/anie.9957319"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,7,13]]},"references-count":26,"journal-issue":{"issue":"38","published-print":{"date-parts":[[2026,9,14]]}},"alternative-id":["10.1002\/anie.9957319"],"URL":"https:\/\/doi.org\/10.1002\/anie.9957319","archive":["Portico"],"relation":{},"ISSN":["1433-7851","1521-3773"],"issn-type":[{"value":"1433-7851","type":"print"},{"value":"1521-3773","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,7,13]]},"assertion":[{"value":"2026-02-09","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-05-21","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-07-13","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e9957319"}}