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However, the development of purely organic thermally activated delayed fluorescence (TADF) sensitizers remains challenging because efficient exciton harvesting, spin conversion, and energy transfer require a delicate balance among multiple competing excited\u2010state processes. Here, we report a molecular design strategy that enables balanced exciton dynamics through the concurrent optimization of reverse intersystem crossing (RISC), intersystem crossing, radiative decay, and nonradiative loss. By integrating a trifluoromethyl\u2010functionalized multi\u2010resonance acceptor with a rigid donor featuring enhanced spin\u2010orbit coupling characteristics as well as an optimized donor\u2013acceptor geometry, the resulting heavy\u2010atom\u2010free TADF sensitizers exhibit near\u2010unity photoluminescence quantum yields, suppressed nonradiative decay, rapid RISC rate, well\u2010regulated spin\u2010conversion and radiative processes. This balanced kinetic profile minimizes exciton accumulation on the sensitizer while promoting efficient exciton transfer to the terminal emitter. Consequently, narrowband green hyperfluorescence OLEDs achieve a maximum external quantum efficiency of 36.1% and retain high efficiencies of 30.6% and 25.4% at ultra\u2010high brightness of 10\u00a0000 and 100\u00a0000\u00a0cd\u00a0m\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    , respectively. These results establish balanced exciton dynamics as an effective design principle for high\u2010performance TADF sensitizers and hyperfluorescence OLEDs.\n                  <\/jats:p>","DOI":"10.1002\/anie.9252872","type":"journal-article","created":{"date-parts":[[2026,9,14]],"date-time":"2026-09-14T07:34:11Z","timestamp":1789371251000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Precise Molecular Design of TADF Sensitizer With Balanced Exciton Dynamics for High\u2010Performance Narrowband Hyperfluorescence OLEDs"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9291-0586","authenticated-orcid":false,"given":"Yang","family":"Zou","sequence":"first","affiliation":[{"name":"Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying","family":"Gao","sequence":"additional","affiliation":[{"name":"Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bingjie","family":"Xie","sequence":"additional","affiliation":[{"name":"Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9999-8840","authenticated-orcid":false,"given":"Xiaosong","family":"Cao","sequence":"additional","affiliation":[{"name":"Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. 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