{
  "abstract": "Overcoming the 25% spin‐statistical limit of fluorescent emitters remains a central challenge in organic electroluminescence. Although radical emitters efficiently harvest doublet excitons in organic light‐emitting diodes, their optoelectronic performance can be affected by limited charge‐carrier mobility and efficiency roll‐off. Here we introduce trityl‐based singlet diradicaloids with small diradical character as a new class of open‐shell emitters and demonstrate their operation in organic light‐emitting transistors (OLETs) using the polychlorinated Thiele hydrocarbon (TTH) as emitter. Comparison with previously reported radical‐based devices reveals spin utilization around or exceeding 0.38 in TTH‐based OLETs. Time‐resolved electroluminescence, fs and ns transient absorption measurements, and quantum‐chemical calculations demonstrate that this enhancement does not originate from triplet–triplet annihilation but from hot‐exciton mechanism enabled by the diradical electronic structure, where the T2 state efficiently repopulates the emissive singlet via reverse intersystem crossing (RISC). Unlike conventional hot‐exciton emitters based on donor–acceptor architectures, this system demonstrates hot‐exciton 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.",
  "abstract_shown": true,
  "affiliations": [
    "Istituto per lo Studio dei Materiali Nanostrutturati Consiglio Nazionale delle Ricerche Bologna Italy",
    "Dipartimento di Chimica “Giacomo Ciamcian” Università di Bologna Bologna Italy",
    "Dipartimenti di Chimica Università degli Studi di Bari Aldo Moro Bari Italy",
    "Department of Chemistry Biology and Biotechnology University of Perugia Perugia Italy",
    "Center for Chemical Catalysis—C3 and INSTM UdR Bologna Alma Mater Studiorum—Università di Bologna Bologna Italy"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 13,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Mario Prosa",
      "orcid": "0000-0002-5697-2103"
    },
    {
      "affs": [
        0
      ],
      "name": "Eugenio Lunedei",
      "orcid": "0000-0002-2666-2577"
    },
    {
      "affs": [
        1
      ],
      "name": "Michele Orza"
    },
    {
      "affs": [
        2
      ],
      "name": "Davide Mesto"
    },
    {
      "affs": [
        3
      ],
      "name": "Roberto Cantoni",
      "orcid": "0009-0007-4809-7023"
    },
    {
      "affs": [
        0
      ],
      "name": "Francesco Reginato"
    },
    {
      "affs": [
        2
      ],
      "name": "Angela Punzi",
      "orcid": "0000-0001-5948-6373"
    },
    {
      "affs": [
        0
      ],
      "name": "Arthur R. J. Barreto",
      "orcid": "0000-0003-0691-763X"
    },
    {
      "affs": [
        1
      ],
      "name": "Yasi Dai",
      "orcid": "0000-0002-4508-7547"
    },
    {
      "affs": [
        3
      ],
      "name": "Benedetta Carlotti",
      "orcid": "0000-0002-2980-2598"
    },
    {
      "affs": [
        1,
        4
      ],
      "name": "Fabrizia Negri",
      "orcid": "0000-0002-0359-0128"
    },
    {
      "affs": [
        0
      ],
      "name": "Stefano Toffanin",
      "orcid": "0000-0003-4099-8664"
    },
    {
      "affs": [
        2
      ],
      "name": "Davide Blasi",
      "orcid": "0000-0002-6887-3364"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/68z8yfsxg3j9n.bib",
  "cited_by": 0,
  "doi": "10.1002/anie.6379738",
  "fulltext_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC13725620/",
  "id": "68z8yfsxg3j9n",
  "issns": [
    "1433-7851",
    "1521-3773"
  ],
  "landing_url": "https://doi.org/10.1002/anie.6379738",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "heading",
      "Communication"
    ],
    [
      "openalex",
      "2208|Organic Light-Emitting Diodes Research"
    ]
  ],
  "openalex": "W7214092907",
  "pdf_url": "https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/anie.6379738",
  "pmcid": "PMC13725620",
  "pmid": "42773783",
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/68z8yfsxg3j9n.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T12:23:58Z",
      "native_id": "PMC13725620",
      "source": "pmc",
      "url": "https://doi.org/10.1002/anie.6379738"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "journal-openalex:1605|Supramolecular Chemistry and Complexes",
      "subfield": "organic"
    }
  ],
  "title": "Beyond Radical Emitters: Hot‐Exciton Electroluminescence From Singlet Diradicaloids",
  "title_text": "Beyond Radical Emitters: Hot‐Exciton Electroluminescence From Singlet Diradicaloids",
  "type": "peer-reviewed",
  "updated_at": "2026-11-06T12:21:49Z",
  "url": "https://research.draconitic.com/paper/68z8yfsxg3j9n",
  "venue": "Angewandte Chemie (International Ed. in English)",
  "versions": []
}