{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T21:31:08Z","timestamp":1792791068876,"version":"4.5.0"},"reference-count":20,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2024,3,25]],"date-time":"2024-03-25T00:00:00Z","timestamp":1711324800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Chem."],"abstract":"<jats:p>Thermally activated delayed fluorescence (TADF) materials with high photoluminescence quantum yields and fast reverse intersystem crossing (RISC) capabilities are highly desirable for applications in high-efficiency organic light-emitting diodes. Herein, we report the synthesis as well as structural and photophysical properties of 5,9-diselena-13b-boranaphtho[3,2,1-<jats:italic>de<\/jats:italic>]anthracene (<jats:bold>SeBSe<\/jats:bold>) as a narrowband-emissive TADF material. The incorporation of two selenium atoms into the boron-fused pentacyclic \u03c0-core results in a small singlet\u2013triplet energy gap (\u0394<jats:italic>E<\/jats:italic><jats:sub>ST<\/jats:sub>) and thereby significant TADF properties. Moreover, theoretical calculations revealed a noticeable spin-orbit coupling enhancement between the singlet and triplet manifolds in <jats:bold>SeBSe<\/jats:bold> by virtue of the heavy-atom effect of selenium atoms. Consequently, <jats:bold>SeBSe<\/jats:bold> allows ultrafast spin-flip RISC with the rate constant surpassing 10<jats:sup>8<\/jats:sup> s<jats:sup>\u22121<\/jats:sup>, which far exceeds the corresponding fluorescence radiative decay rate (\u223c10<jats:sup>6<\/jats:sup> s<jats:sup>\u22121<\/jats:sup>), enabling an ideal singlet\u2013triplet superimposed excited state.<\/jats:p>","DOI":"10.3389\/fchem.2024.1375552","type":"journal-article","created":{"date-parts":[[2024,3,25]],"date-time":"2024-03-25T04:38:00Z","timestamp":1711341480000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":17,"title":["Ultrafast spin-flip exciton conversion and narrowband sky-blue luminescence in a fused polycyclic selenaborin emitter"],"prefix":"10.3389","volume":"12","author":[{"given":"Sudhir K.","family":"Keshri","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guanting","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takuma","family":"Yasuda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2024,3,25]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"eabe5769","DOI":"10.1126\/sciadv.abe5769","article-title":"Thermal equilibration between singlet and triplet excited states in organic fluorophore for submicrosecond delayed fluorescence","volume":"7","author":"Aizawa","year":"2021","journal-title":"Sci. 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