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Benefiting from a fully resonating extended helical \u03c0-conjugated system, this compound has a small\n                    <jats:italic>\u0394E<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    value of 3.6\u2009meV and sufficient spin\u2013orbit coupling to exhibit a high-rate constant for reverse intersystem crossing (\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    \u2009=\u20091.1 \u00d7 10\n                    <jats:sup>6\u2009<\/jats:sup>\n                    s\n                    <jats:sup>\u20131<\/jats:sup>\n                    ). Furthermore, an organic light-emitting diode employing DOB2-DABNA-A as an emitter is fabricated; it exhibits ultrapure deep-blue emission at 452\u2009nm with a small full width at half maximum of 24\u2009nm, corresponding to Commission Internationale de l\u2019\u00c9clairage (CIE) coordinates of (0.145, 0.049). The high\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    value reduces the efficiency roll-off, resulting in a high external quantum efficiency (EQE) of 21.6% at 1000\u2009cd\u2009m\n                    <jats:sup>\u20132<\/jats:sup>\n                    .\n                  <\/jats:p>","DOI":"10.1038\/s41467-024-46619-8","type":"journal-article","created":{"date-parts":[[2024,4,2]],"date-time":"2024-04-02T06:01:57Z","timestamp":1712037717000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":105,"title":["Highly efficient multi-resonance thermally activated delayed fluorescence material toward a BT.2020 deep-blue emitter"],"prefix":"10.1038","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4275-3898","authenticated-orcid":false,"given":"Junki","family":"Ochi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuki","family":"Yamasaki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kojiro","family":"Tanaka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yasuhiro","family":"Kondo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kohei","family":"Isayama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Susumu","family":"Oda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masakazu","family":"Kondo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7483-9525","authenticated-orcid":false,"given":"Takuji","family":"Hatakeyama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,4,2]]},"reference":[{"key":"46619_CR1","doi-asserted-by":"publisher","first-page":"913","DOI":"10.1063\/1.98799","volume":"51","author":"CW Tang","year":"1987","unstructured":"Tang, C. 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