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However, conventional MR\u2010type thermally activated delayed fluorescence (MR\u2010TADF) emitters suffer from severe efficiency roll\u2010off in OLEDs operated at high brightness due to slow reverse intersystem crossing (RISC). Here, we report the first MR\u2010TADF emitters incorporating tellurium (Te)\u2014the heaviest stable chalcogen\u2014to accelerate the spin\u2010flip RISC process through enhanced spin\u2013orbit coupling. Our design strategy involves tethering dibenzo[\n                    <jats:italic>b<\/jats:italic>\n                    ,\n                    <jats:italic>d<\/jats:italic>\n                    ]tellurophene as a RISC booster to a representative MR skeleton, thereby promoting efficient delayed fluorescence. The resulting Te\u2010containing MR\u2010TADF emitters exhibit fast RISC rates of up to 2.8\u00a0\u00d7\u00a010\n                    <jats:sup>6<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    and narrow emission bandwidths of 23\u201325\u00a0nm in solution. OLEDs fabricated with these emitters achieve exceptional high external quantum efficiencies (EQEs) of up to 35.3%, with significantly reduced efficiency roll\u2010off, maintaining EQEs of 32.2% and 25.4% even at very high brightness levels of 10\n                    <jats:sup>3<\/jats:sup>\n                    and 10\n                    <jats:sup>4<\/jats:sup>\n                    \u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , respectively. This study demonstrates the potential of Te\u2010containing MR\u2010TADF systems for next\u2010generation OLEDs and highlights their functional impact on device performance.\n                  <\/jats:p>","DOI":"10.1002\/anie.202524098","type":"journal-article","created":{"date-parts":[[2025,12,26]],"date-time":"2025-12-26T09:26:55Z","timestamp":1766741215000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Tellurophene\u2010Induced Triplet\u2013Singlet Spin\u2010Flip Acceleration: An Advanced Design for Narrowband Organoboron Emitters with Fast Reverse Intersystem Crossing"],"prefix":"10.1002","volume":"65","author":[{"given":"Peiyuan","family":"Yang","sequence":"first","affiliation":[{"name":"Department of Applied Chemistry Graduate School of Engineering Kyushu University  744 Motooka, Nishi\u2010ku Fukuoka 819\u20100395 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun Hyeon","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Applied Chemistry Graduate School of Engineering Kyushu University  744 Motooka, Nishi\u2010ku Fukuoka 819\u20100395 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kotone","family":"Urano","sequence":"additional","affiliation":[{"name":"Institute for Advanced Study Kyushu University  744 Motooka, Nishi\u2010ku Fukuoka 819\u20100395 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1586-4701","authenticated-orcid":false,"given":"Takuma","family":"Yasuda","sequence":"additional","affiliation":[{"name":"Department of Applied Chemistry Graduate School of Engineering Kyushu University  744 Motooka, Nishi\u2010ku Fukuoka 819\u20100395 Japan"},{"name":"Institute for Advanced Study Kyushu University  744 Motooka, Nishi\u2010ku Fukuoka 819\u20100395 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