{
  "abstract": "Efficient, ultrapure green organic light-emitting diodes (OLEDs) fabricated via wet processing are crucial for ultrahigh definition displays but remain highly challenging due to the paucity of suitable emitters. Herein, we developed Oly-BN, a novel multipleresonance thermally activated delayed fluorescence (MR-TADF) emitter featuring a distinct Olympic-patterned boron-distribution. The zigzag doped heteroatom polycyclic aromatic framework enables near-degenerate singlet/triplet excited states. Integrating para-N-π-B motifs helps regulate the triplet manifold and emission color point, enabling energetically accessible higher lying triplet excited states with enhanced spinorbit coupling, while also suppressing low-frequency structural relaxation and modulating the optical bandgap. Oly-BN in toluene exhibits vivid green emission at 522 nm with a narrow full width at half maximum (FWHM) of 17 nm, a photoluminescence quantum yield of 95%, and a fast reverse intersystem crossing rate constant of 6.9×106 s−1. Additionally, its highly twisted conformation weakens intermolecular interactions and favors bright, solid-state emission. The nonsensitized solution-processed OLEDs deliver ultrapure green electroluminescence with a CIEy value up to 0.73, and achieves an optimized maximum external quantum efficiency of 39.4%, which remains high at 29.9% at 1000 cd m-2. This work not only provides a promising highly saturated green emitter for solution-processed OLEDs but also demonstrates the importance of precisely integrating heteroatoms in modulating photophysical properties of MR-TADF emitters.",
  "abstract_shown": true,
  "affiliations": [
    "School of Materials Science and Engineering",
    "Suzhou University of Science and Technology Suzhou",
    "Soochow University",
    "EaStCHEM School of Chemistry",
    "University of St Andrews"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 11,
  "authors": [
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Xin Xiong"
    },
    {
      "affs": [
        2
      ],
      "name": "Rajat Walia"
    },
    {
      "affs": [
        3,
        4
      ],
      "name": "Dongyang Chen"
    },
    {
      "affs": [
        2
      ],
      "name": "Cheng-Xi Li"
    },
    {
      "affs": [
        2
      ],
      "name": "Xiao-Chun Fan"
    },
    {
      "affs": [
        2
      ],
      "name": "Xian-Kai Chen"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Yi-Zhong Shi"
    },
    {
      "affs": [
        2
      ],
      "name": "Jia Yu"
    },
    {
      "affs": [
        3,
        4
      ],
      "name": "Eli Zysman-Colman",
      "orcid": "0000-0001-7183-6022"
    },
    {
      "affs": [
        2
      ],
      "name": "Kai Wang"
    },
    {
      "affs": [
        2
      ],
      "name": "Xiao-Hong Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6z07bxfv11cer.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15008535/v1",
  "fulltext_url": null,
  "id": "6z07bxfv11cer",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008535/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2208|Organic Light-Emitting Diodes Research"
    ]
  ],
  "openalex": "W7212043837",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15008535/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/6z07bxfv11cer.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:19Z",
      "native_id": "10.26434/chemrxiv.15008535",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008535/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "source:chemrxiv",
      "subfield": "general"
    }
  ],
  "title": "Olympic-patterned pentaboron emitter featuring highly distorted geometry enables efficient solution-processed ultrapure green OLEDs",
  "title_text": "Olympic-patterned pentaboron emitter featuring highly distorted geometry enables efficient solution-processed ultrapure green OLEDs",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:19Z",
  "url": "https://research.draconitic.com/paper/6z07bxfv11cer",
  "venue": "ChemRxiv",
  "versions": []
}