{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T15:57:20Z","timestamp":1791475040014,"version":"4.3.4"},"reference-count":29,"publisher":"Wiley","issue":"56","license":[{"start":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T00:00:00Z","timestamp":1785974400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T00:00:00Z","timestamp":1785974400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["advanced.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Advanced Materials"],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Thermally activated delayed fluorescence (TADF) offers a powerful route for harvesting triplet excitons in organic scintillators, yet achieving simultaneously small singlet\u2013triplet gaps and efficient spin\u2013orbit coupling (SOC) in rigid molecular crystals remains a fundamental challenge. Here we demonstrate that targeted halogen substitution can activate vibrationally assisted spin\u2010flip channels that dramatically enhance triplet harvesting in crystalline donor\u2010acceptor emitters, tailoring them for scintillators with higher light yield and faster response times. Using\n                    <jats:bold>DMAC\u2010TRZ<\/jats:bold>\n                    derivatives bearing fluorine or chlorine substituents, we combine single\u2010crystal structural analysis, temperature\u2010resolved photoluminescence, radioluminescence spectroscopy, and quantum\u2010chemical calculations to reveal how subtle changes in halogen chemistry control excited\u2010state dynamics. Fluorination lowers the rISC activation barrier to 7.1 meV, consistent with an almost degenerate emissive singlet\u2013triplet manifold, whereas chlorine additionally introduces dynamic SOC enhancement mediated by Cl\u2010atom vibrations within the crystal lattice. As a result, the chlorinated crystal exhibits an exceptionally small\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>a<\/jats:sub>\n                    of 3.9 meV, (sub)microsecond\u2010scale delayed fluorescence, and a scintillation yield of 26\u00a0000 photons MeV\n                    <jats:sup>\u22121<\/jats:sup>\n                    . These results reveal a powerful, targeted approach to achieving near S\n                    <jats:sub>1<\/jats:sub>\n                    \u2010T\n                    <jats:sub>1<\/jats:sub>\n                    degeneracy combined with vibrationally activated heavy\u2010atom effects, enabling high\u2010performance TADF scintillators in organic crystals.\n                  <\/jats:p>","DOI":"10.1002\/adma.74520","type":"journal-article","created":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T04:04:37Z","timestamp":1786075477000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Specific Position of Halogen in Crystalline TADF Scintillators Enables Efficient Triplet Harvesting Through Vibrational Modulation of Spin\u2013Orbit Coupling"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4563-0773","authenticated-orcid":false,"given":"Illia E.","family":"Serdiuk","sequence":"first","affiliation":[{"name":"Faculty of Mathematics, Physics and Informatics University of Gda\u0144sk  Gda\u0144sk Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6909-7590","authenticated-orcid":false,"given":"Micha\u0142","family":"Mo\u0144ka","sequence":"additional","affiliation":[{"name":"Faculty of Mathematics, Physics and Informatics University of Gda\u0144sk  Gda\u0144sk Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4559-7870","authenticated-orcid":false,"given":"Artur","family":"Sikorski","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry University of Gdansk  Gda\u0144sk Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7459-7194","authenticated-orcid":false,"given":"Konrad J.","family":"Drozdowski","sequence":"additional","affiliation":[{"name":"Faculty of Physics, Astronomy and Informatics Institute of Physics Nicolaus Copernicus University in Toru\u0144  Toru\u0144 Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5534-4084","authenticated-orcid":false,"given":"Mohanad S.","family":"Eid","sequence":"additional","affiliation":[{"name":"Faculty of Physics, Astronomy and Informatics Institute of Physics Nicolaus Copernicus University in Toru\u0144  Toru\u0144 Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0681-7727","authenticated-orcid":false,"given":"Krzysztof","family":"Wisniewski","sequence":"additional","affiliation":[{"name":"Faculty of Physics, Astronomy and Informatics Institute of Physics Nicolaus Copernicus University in Toru\u0144  Toru\u0144 Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3920-5532","authenticated-orcid":false,"given":"Damian","family":"Trzybi\u0144ski","sequence":"additional","affiliation":[{"name":"Biological and Chemical Research Centre University of Warsaw  Warsaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6282-8610","authenticated-orcid":false,"given":"Marcin E.","family":"Witkowski","sequence":"additional","affiliation":[{"name":"Faculty of Physics, Astronomy and Informatics Institute of Physics Nicolaus Copernicus University in Toru\u0144  Toru\u0144 Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6207-4801","authenticated-orcid":false,"given":"Winicjusz","family":"Drozdowski","sequence":"additional","affiliation":[{"name":"Faculty of Physics, Astronomy and Informatics Institute of Physics Nicolaus Copernicus University in Toru\u0144  Toru\u0144 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