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Herein, a blue organic emitter is reported that exhibits hot\u2010exciton and aggregation\u2010induced emission characteristics, and use it as a sensitizer in the proposed triplet\u2013triplet annihilation (TTA)\u2010assisted hot\u2010exciton\u2010sensitized fluorescence (HSF) device, abbreviated THSF. Results show that through dual\u2010channel stepwise F\u00f6rster and Dexter energy transfer processes, the THSF system can simultaneously enhance exciton utilization, accelerate exciton dynamics, and reduce the concentration of triplet excitons. The smooth management of excitons makes the overall performance of the THSF device superior to the control TTA fluorescence and HSF devices. Furthermore, a high\u2010performance narrowband blue (CIE\n                    <jats:sub>x,y<\/jats:sub>\n                    = 0.13, 0.12) OLED is achieved using a two\u2010unit tandem device design, providing an excellent maximum external quantum efficiency of 18.3%, a record\u2010high\n                    <jats:italic>L<\/jats:italic>\n                    <jats:sub>90%<\/jats:sub>\n                    (the luminance where the\n                    <jats:italic>\u019e<\/jats:italic>\n                    <jats:sub>ext<\/jats:sub>\n                    drops to 90% of its peak value) of \u224820\u00a0000\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , and a long half\u2010lifetime at 100\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    initial luminance of \u224813\u00a0256\u00a0h. These results showcase the great potential of the THSF strategy in realizing efficient and stable blue OLEDs with narrow emission and high luminance.\n                  <\/jats:p>","DOI":"10.1002\/adma.202419217","type":"journal-article","created":{"date-parts":[[2025,3,29]],"date-time":"2025-03-29T21:38:13Z","timestamp":1743284293000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Hot\u2010Exciton\u2010Involved Dual\u2010Channel Stepwise Energy Transfer Enabling Efficient and Stable Blue OLEDs with Narrow Emission and High Luminance"],"prefix":"10.1002","volume":"37","author":[{"given":"Han","family":"Zhang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 P. R. 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