{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T06:59:45Z","timestamp":1790146785042,"version":"4.0.1"},"reference-count":52,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T00:00:00Z","timestamp":1790035200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T00:00:00Z","timestamp":1790035200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Angew Chem Int Ed"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Overcoming the 25% spin\u2010statistical limit of fluorescent emitters remains a central challenge in organic electroluminescence. Although radical emitters efficiently harvest doublet excitons in organic light\u2010emitting diodes, their optoelectronic performance can be affected by limited charge\u2010carrier mobility and efficiency roll\u2010off. Here we introduce trityl\u2010based singlet diradicaloids with small diradical character as a new class of open\u2010shell emitters and demonstrate their operation in organic light\u2010emitting transistors (OLETs) using the polychlorinated Thiele hydrocarbon (\n                    <jats:bold>TTH<\/jats:bold>\n                    ) as emitter. Comparison with previously reported radical\u2010based devices reveals spin utilization around or exceeding 0.38 in\n                    <jats:bold>TTH<\/jats:bold>\n                    \u2010based OLETs. Time\u2010resolved electroluminescence, fs and ns transient absorption measurements, and quantum\u2010chemical calculations demonstrate that this enhancement does not originate from triplet\u2013triplet annihilation but from hot\u2010exciton mechanism enabled by the diradical electronic structure, where the T\n                    <jats:sub>2<\/jats:sub>\n                    state efficiently repopulates the emissive singlet via reverse intersystem crossing (RISC). Unlike conventional hot\u2010exciton emitters based on donor\u2013acceptor architectures, this system demonstrates hot\u2010exciton behavior in a singlet diradicaloid framework. Reduced charge trapping further highlights singlet diradicaloids with small diradical character as promising platforms for efficient and stable electroluminescent devices.\n                  <\/jats:p>","DOI":"10.1002\/anie.6379738","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T06:02:21Z","timestamp":1790143341000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Beyond Radical Emitters: Hot\u2010Exciton Electroluminescence From Singlet Diradicaloids"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5697-2103","authenticated-orcid":false,"given":"Mario","family":"Prosa","sequence":"first","affiliation":[{"name":"Istituto per lo Studio dei Materiali Nanostrutturati Consiglio Nazionale delle Ricerche  Bologna Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2666-2577","authenticated-orcid":false,"given":"Eugenio","family":"Lunedei","sequence":"additional","affiliation":[{"name":"Istituto per lo Studio dei Materiali Nanostrutturati Consiglio Nazionale delle Ricerche  Bologna Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michele","family":"Orza","sequence":"additional","affiliation":[{"name":"Dipartimento di Chimica \u201cGiacomo Ciamcian\u201d Universit\u00e0 di Bologna  Bologna Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Davide","family":"Mesto","sequence":"additional","affiliation":[{"name":"Dipartimenti di Chimica Universit\u00e0 degli Studi di Bari Aldo Moro  Bari Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-4809-7023","authenticated-orcid":false,"given":"Roberto","family":"Cantoni","sequence":"additional","affiliation":[{"name":"Department of Chemistry Biology and Biotechnology University of Perugia  Perugia Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesco","family":"Reginato","sequence":"additional","affiliation":[{"name":"Istituto per lo Studio dei Materiali Nanostrutturati Consiglio Nazionale delle Ricerche  Bologna Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5948-6373","authenticated-orcid":false,"given":"Angela","family":"Punzi","sequence":"additional","affiliation":[{"name":"Dipartimenti di Chimica Universit\u00e0 degli Studi di Bari Aldo Moro  Bari Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0691-763X","authenticated-orcid":false,"given":"Arthur R. J.","family":"Barreto","sequence":"additional","affiliation":[{"name":"Istituto per lo Studio dei Materiali Nanostrutturati Consiglio Nazionale delle Ricerche  Bologna Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4508-7547","authenticated-orcid":false,"given":"Yasi","family":"Dai","sequence":"additional","affiliation":[{"name":"Dipartimento di Chimica \u201cGiacomo Ciamcian\u201d Universit\u00e0 di Bologna  Bologna Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2980-2598","authenticated-orcid":false,"given":"Benedetta","family":"Carlotti","sequence":"additional","affiliation":[{"name":"Department of Chemistry Biology and Biotechnology University of Perugia  Perugia Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0359-0128","authenticated-orcid":false,"given":"Fabrizia","family":"Negri","sequence":"additional","affiliation":[{"name":"Dipartimento di Chimica \u201cGiacomo Ciamcian\u201d Universit\u00e0 di Bologna  Bologna Italy"},{"name":"Center for Chemical Catalysis\u2014C3 and INSTM UdR Bologna Alma Mater Studiorum\u2014Universit\u00e0 di Bologna  Bologna Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4099-8664","authenticated-orcid":false,"given":"Stefano","family":"Toffanin","sequence":"additional","affiliation":[{"name":"Istituto per lo Studio dei Materiali Nanostrutturati Consiglio Nazionale delle Ricerche  Bologna Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6887-3364","authenticated-orcid":false,"given":"Davide","family":"Blasi","sequence":"additional","affiliation":[{"name":"Dipartimenti di Chimica Universit\u00e0 degli Studi di Bari Aldo Moro  Bari Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,22]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1063\/5.0047636"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1039\/D1TC05268C"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2CS00772J"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1063\/5.0246006"},{"key":"e_1_2_8_6_1","doi-asserted-by":"crossref","first-page":"1731","DOI":"10.1039\/D3QM01067H","article-title":"Recent Advances in Highly\u2010Efficient Near Infrared OLED Emitters","volume":"8","author":"dos Santos P. 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