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The MR blue fluorescent emitter has a di\u2010tert\u2010butyl benzene substituent in the MR core structure to minimize quenching mechanisms by intermolecular interaction. The emitter shows a high photoluminescence quantum yield and small full width at half maximum of 22 nm, which realize high external quantum efficiency (EQE) of 11.4% in the single unit OLED and device lifetime up to 95% of the initial luminance (LT\n                    <jats:sub>95<\/jats:sub>\n                    ) of 208 h at 1000 cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    and over 10\u00a0000 h at 100 cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . The optimized tandem device of the new blue emitter achieves high EQE over 25% and extremely long LT\n                    <jats:sub>95<\/jats:sub>\n                    of over 500\u00a0h at 1000 cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    and 30\u00a0000 h at 100 cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . The lifetime of this work is one of the best data of blue OLED lifetime reported in the literature.\n                  <\/jats:p>","DOI":"10.1002\/adma.202108581","type":"journal-article","created":{"date-parts":[[2022,3,25]],"date-time":"2022-03-25T06:47:32Z","timestamp":1648190852000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":164,"title":["High Efficiency of over 25% and Long Device Lifetime of over 500 h at 1000 nit in Blue Fluorescent Organic Light\u2010Emitting Diodes"],"prefix":"10.1002","volume":"34","author":[{"given":"Jinho","family":"Park","sequence":"first","affiliation":[{"name":"School of Chemical Engineering Sungkyunkwan University  2066, Seobu\u2010ro, Jangan\u2010gu Suwon\u2010si Gyeonggi\u2010do 16419 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ki Ju","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Information Display Hongik University  Seoul 121\u2010791 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junseop","family":"Lim","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering Sungkyunkwan University  2066, Seobu\u2010ro, Jangan\u2010gu Suwon\u2010si Gyeonggi\u2010do 16419 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taekyung","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Information Display Hongik University  Seoul 121\u2010791 Korea"},{"name":"Department of Materials Science and Engineering Hongik University  Sejong 30016 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7677-0605","authenticated-orcid":false,"given":"Jun Yeob","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering Sungkyunkwan University  2066, Seobu\u2010ro, Jangan\u2010gu Suwon\u2010si Gyeonggi\u2010do 16419 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,4,24]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202100630"},{"key":"e_1_2_8_2_1","first-page":"5874","volume":"7","author":"Lee J.\u2010H.","year":"2019","journal-title":"J. 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