Olympic-patterned pentaboron emitter featuring highly distorted geometry enables efficient solution-processed ultrapure green OLEDs
5 affiliations
- 1School of Materials Science and Engineering
- 2Suzhou University of Science and Technology Suzhou
- 3Soochow University
- 4EaStCHEM School of Chemistry
- 5University of St Andrews
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.
Related
- Efficient and Ambient-Air Processed Perovskite Solar Cells Enabled by Adamantanethiol as a Dual-Action Modulator
- Reversible dissociation of a sterically distorted dimer of a phosphagermylenylidene
- Structure-Property Relations on Exchange Couplings in distorted Halidebridged Gd(III) Complexes
- Multicenter Bonding in Wilkinson's Catalyst: A Theoretical Study from a Distorted Monomer to a Localized Dimer.
- Ferrier Rearrangement Intermediates Featuring Aliphatic Acyl Protecting Groups
BibTeX
@misc{xiong2026olympicpatterned,
title = {{Olympic-patterned pentaboron emitter featuring highly distorted geometry enables efficient solution-processed ultrapure green OLEDs}},
author = {Xin Xiong and Rajat Walia and Dongyang Chen and Cheng-Xi Li and Xiao-Chun Fan and Xian-Kai Chen and Yi-Zhong Shi and Jia Yu and Eli Zysman-Colman and Kai Wang and Xiao-Hong Zhang},
howpublished = {ChemRxiv},
year = {2026},
month = sep,
doi = {10.26434/chemrxiv.15008535/v1},
url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008535/v1},
note = {CC BY},
}
RIS
TY - UNPB
TI - Olympic-patterned pentaboron emitter featuring highly distorted geometry enables efficient solution-processed ultrapure green OLEDs
AU - Xin Xiong
AU - Rajat Walia
AU - Dongyang Chen
AU - Cheng-Xi Li
AU - Xiao-Chun Fan
AU - Xian-Kai Chen
AU - Yi-Zhong Shi
AU - Jia Yu
AU - Eli Zysman-Colman
AU - Kai Wang
AU - Xiao-Hong Zhang
PY - 2026
DA - 2026/09/09
PB - ChemRxiv
DO - 10.26434/chemrxiv.15008535/v1
UR - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008535/v1
AB - 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.
ER -