{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T00:51:48Z","timestamp":1789001508974,"version":"build-2803163510"},"reference-count":52,"publisher":"Wiley","issue":"33","license":[{"start":{"date-parts":[[2025,6,22]],"date-time":"2025-06-22T00:00:00Z","timestamp":1750550400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004543","name":"China Scholarship Council","doi-asserted-by":"publisher","award":["202006250026"],"award-info":[{"award-number":["202006250026"]}],"id":[{"id":"10.13039\/501100004543","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000266","name":"Engineering and Physical Sciences Research Council","doi-asserted-by":"publisher","award":["EP\/X026175\/1"],"award-info":[{"award-number":["EP\/X026175\/1"]}],"id":[{"id":"10.13039\/501100000266","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2025,8,11]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Nitrogen\/carbonyl (N\/C\u2550O) based multi\u2010resonant thermally activated delayed fluorescence (MR\u2010TADF) emitters are attractive due to their bright, narrowband emission and the ease with which they can be synthesized. However, their photophysics typically suffer from slow reverse intersystem crossing (RISC) because of their relatively large singlet\u2010triplet energy gap (\u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    ). Thus, the organic light\u2010emitting diodes (OLEDs) with these emitters typically show severe efficiency roll\u2010off. Here, two MR\u2010TADF emitters\n                    <jats:bold>DiKTaSe<\/jats:bold>\n                    and\n                    <jats:bold>tBuCz\u2010DiKTaSe<\/jats:bold>\n                    have been designed and synthesized. The introduction of selenium in the form of an annelated benzoselenophene enhances spin\u2010orbit coupling and increases the RISC rate. The twisted\n                    <jats:italic>ortho<\/jats:italic>\n                    \u2010substituted\n                    <jats:italic>tert<\/jats:italic>\n                    \u2010butylcarbazole moiety in\n                    <jats:bold>tBuCz\u2010DiKTaSe<\/jats:bold>\n                    helps to suppress aggregation\u2010caused quenching of the emission in films. In addition, the large size of the selenium atom and long C\u2500Se bonds induce helical chirality in both\n                    <jats:bold>DiKTaSe<\/jats:bold>\n                    and\n                    <jats:bold>tBuCz\u2010DiKTaSe<\/jats:bold>\n                    . Finally, the OLEDs with\n                    <jats:bold>DiKTaSe<\/jats:bold>\n                    showed maximum external quantum efficiency (EQE\n                    <jats:sub>max<\/jats:sub>\n                    ) of 22.7% while OLEDs with\n                    <jats:bold>tBuCz\u2010DiKTaSe<\/jats:bold>\n                    showed a higher EQE\n                    <jats:sub>max<\/jats:sub>\n                    of 27.8% and less\u2010pronounced efficiency roll\u2010off, with EQE at 100 cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    (EQE\n                    <jats:sub>100<\/jats:sub>\n                    )\/ EQE at 1000 cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    (EQE\n                    <jats:sub>1000<\/jats:sub>\n                    ) of 23.5\/12.5%. These efficiency values are amongst the highest of devices employing DiKTa\u2010based emitters. Our work provides key insight into how to judiciously employ heavy atoms to increase the performance of the emitter and the device.\n                  <\/jats:p>","DOI":"10.1002\/anie.202506999","type":"journal-article","created":{"date-parts":[[2025,6,10]],"date-time":"2025-06-10T14:34:03Z","timestamp":1749566043000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Chiral Selenium\u2010Integrated Multi\u2010Resonant Thermally Activated Delayed Fluorescent Emitters Showing Improved Reverse Intersystem Crossing Rate"],"prefix":"10.1002","volume":"64","author":[{"given":"Jingxiang","family":"Wang","sequence":"first","affiliation":[{"name":"Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews  St Andrews Fife KY16 9ST UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9647-008X","authenticated-orcid":false,"given":"Hassan","family":"Hafeez","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, SUPA School of Physics and Astronomy University of St Andrews  St Andrews KY16 9SS UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongyang","family":"Chen","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews  St Andrews Fife KY16 9ST UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jhon Sebastian Oviedo","family":"Ortiz","sequence":"additional","affiliation":[{"name":"University of Rennes, CNRS ISCR (Institut des Sciences Chimiques de Rennes) \u2013 UMR 6226  Rennes F\u201035000 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Xu","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews  St Andrews Fife KY16 9ST 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 Fife KY16 9ST UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David B.","family":"Cordes","sequence":"additional","affiliation":[{"name":"Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews  St Andrews Fife KY16 9ST UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4037-6067","authenticated-orcid":false,"given":"Jeanne","family":"Crassous","sequence":"additional","affiliation":[{"name":"University of Rennes, CNRS ISCR (Institut des Sciences Chimiques de Rennes) \u2013 UMR 6226  Rennes F\u201035000 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7821-7208","authenticated-orcid":false,"given":"Ifor D. 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