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Here, we present an integrated materials\u2010to\u2010device strategy enabling narrowband, high\u2010efficiency red multi\u2010resonance thermally activated delayed fluorescence (MR\u2010TADF) organic light\u2010emitting diodes (OLEDs) with suppressed roll\u2010off and extended operational lifetime. Three boron\u2013nitrogen\u2013oxygen (BNO)\u2010fused emitters\u20144BPBNO, 3DBFBNO, and 2DBFBNO\u2014were rationally designed by modulating multi\u2010resonance pathways and incorporating dibenzofuran (DBF) units. The rigidified \u03c0\u2010framework suppresses vibronically active C\u2013C stretching modes, enabling precise color tuning while preserving MR character and high photoluminescence quantum yield (PLQY). As a result, 3DBFBNO exhibits red emission with a peak wavelength of 613\u00a0nm and a narrow full width at half maximum (FWHM) of 32\u00a0nm. To overcome the intrinsic roll\u2010off of MR\u2010TADF systems, an exciplex\u2010assisted phosphorescent\u2010sensitized fluorescence (Ex\u2010PSF) architecture was employed. The 3DBFBNO optimized device achieved a peak external quantum efficiency of 31.6%, &lt;1% roll\u2010off at 5000\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , and LT\n                    <jats:sub>90<\/jats:sub>\n                    of 571\u00a0h @ 5000 cd\u00a0m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , representing a 13\u2010fold lifetime enhancement over single\u2010host devices. Additionally, an optical\u2010cavity\u2010engineered top\u2010emission OLED incorporating 3DBFBNO further achieved 619\u00a0nm emission, 23\u00a0nm FWHM, along with CIE coordinates of (0.68, 0.32), approaching BT.2020 requirements.\n                  <\/jats:p>","DOI":"10.1002\/smll.74546","type":"journal-article","created":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T08:54:16Z","timestamp":1786524856000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dibenzofuran\u2010Modulated Narrowband Red MR\u2010TADF Emitters for BT.2020 OLEDs With Ultralow Roll\u2010Off and Long Lifetime"],"prefix":"10.1002","volume":"22","author":[{"given":"Meghana","family":"Tirupati","sequence":"first","affiliation":[{"name":"Department of Information Display Organic Optoelectronic Device Laboratory (OODL) Kyung Hee University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nisha","family":"Vergineya S","sequence":"additional","affiliation":[{"name":"Department of Information Display Organic Optoelectronic Device Laboratory (OODL) Kyung Hee University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Odugu Pavan","family":"Kumar","sequence":"additional","affiliation":[{"name":"Department of Information Display Organic Optoelectronic Device Laboratory (OODL) Kyung Hee University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aradhya","family":"Rajput","sequence":"additional","affiliation":[{"name":"Department of Information Display Organic Optoelectronic Device Laboratory (OODL) Kyung Hee University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hae Ung","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Information Display Organic Optoelectronic Device Laboratory (OODL) Kyung Hee University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun Yun","family":"Kim","sequence":"additional","affiliation":[{"name":"LG Display Co. 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Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Subramanian","family":"Muruganantham","sequence":"additional","affiliation":[{"name":"Department of Information Display Organic Optoelectronic Device Laboratory (OODL) Kyung Hee University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1743-1486","authenticated-orcid":false,"given":"Jang Hyuk","family":"Kwon","sequence":"additional","affiliation":[{"name":"Department of Information Display Organic Optoelectronic Device Laboratory (OODL) Kyung Hee University  Seoul Republic of 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