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Confining donor conformation distributions for efficient thermally activated delayed fluorescence with fast spin-flipping

Qiu, Weidong ; Liu, Denghui ; Li, Mengke ; Cai, Xinyi ; Chen, Zijian ; He, Yanmei LU ; Liang, Baoyan ; Peng, Xiaomei ; Qiao, Zhenyang and Chen, Jiting , et al. (2023) In Nature Communications 14(1). p.2564-2564
Abstract

Fast spin-flipping is the key to exploit the triplet excitons in thermally activated delayed fluorescence based organic light-emitting diodes toward high efficiency, low efficiency roll-off and long operating lifetime. In common donor-acceptor type thermally activated delayed fluorescence molecules, the distribution of dihedral angles in the film state would have significant influence on the photo-physical properties, which are usually neglected by researches. Herein, we find that the excited state lifetimes of thermally activated delayed fluorescence emitters are subjected to conformation distributions in the host-guest system. Acridine-type flexible donors have a broad conformation distribution or bimodal distribution, in which some... (More)

Fast spin-flipping is the key to exploit the triplet excitons in thermally activated delayed fluorescence based organic light-emitting diodes toward high efficiency, low efficiency roll-off and long operating lifetime. In common donor-acceptor type thermally activated delayed fluorescence molecules, the distribution of dihedral angles in the film state would have significant influence on the photo-physical properties, which are usually neglected by researches. Herein, we find that the excited state lifetimes of thermally activated delayed fluorescence emitters are subjected to conformation distributions in the host-guest system. Acridine-type flexible donors have a broad conformation distribution or bimodal distribution, in which some conformers feature large singlet-triplet energy gap, leading to long excited state lifetime. Utilization of rigid donors with steric hindrance can restrict the conformation distributions in the film to achieve degenerate singlet and triplet states, which is beneficial to efficient reverse intersystem crossing. Based on this principle, three prototype thermally activated delayed fluorescence emitters with confined conformation distributions are developed, achieving high reverse intersystem crossing rate constants greater than 10
6 s
-1, which enable highly efficient solution-processed organic light-emitting diodes with suppressed efficiency roll-off.

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publishing date
type
Contribution to journal
publication status
published
in
Nature Communications
volume
14
issue
1
pages
2564 - 2564
publisher
Nature Publishing Group
external identifiers
  • pmid:37142564
  • scopus:85159550399
ISSN
2041-1723
DOI
10.1038/s41467-023-38197-y
language
English
LU publication?
no
additional info
© 2023. The Author(s).
id
43ca4e0c-b160-4bdc-a755-412388007221
date added to LUP
2024-05-03 11:57:55
date last changed
2024-06-01 07:19:18
@article{43ca4e0c-b160-4bdc-a755-412388007221,
  abstract     = {{<p>Fast spin-flipping is the key to exploit the triplet excitons in thermally activated delayed fluorescence based organic light-emitting diodes toward high efficiency, low efficiency roll-off and long operating lifetime. In common donor-acceptor type thermally activated delayed fluorescence molecules, the distribution of dihedral angles in the film state would have significant influence on the photo-physical properties, which are usually neglected by researches. Herein, we find that the excited state lifetimes of thermally activated delayed fluorescence emitters are subjected to conformation distributions in the host-guest system. Acridine-type flexible donors have a broad conformation distribution or bimodal distribution, in which some conformers feature large singlet-triplet energy gap, leading to long excited state lifetime. Utilization of rigid donors with steric hindrance can restrict the conformation distributions in the film to achieve degenerate singlet and triplet states, which is beneficial to efficient reverse intersystem crossing. Based on this principle, three prototype thermally activated delayed fluorescence emitters with confined conformation distributions are developed, achieving high reverse intersystem crossing rate constants greater than 10<br>
 6 s<br>
 -1, which enable highly efficient solution-processed organic light-emitting diodes with suppressed efficiency roll-off.<br>
 </p>}},
  author       = {{Qiu, Weidong and Liu, Denghui and Li, Mengke and Cai, Xinyi and Chen, Zijian and He, Yanmei and Liang, Baoyan and Peng, Xiaomei and Qiao, Zhenyang and Chen, Jiting and Li, Wei and Pu, Junrong and Xie, Wentao and Wang, Zhiheng and Li, Deli and Gan, Yiyang and Jiao, Yihang and Gu, Qing and Su, Shi-Jian}},
  issn         = {{2041-1723}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{1}},
  pages        = {{2564--2564}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Communications}},
  title        = {{Confining donor conformation distributions for efficient thermally activated delayed fluorescence with fast spin-flipping}},
  url          = {{http://dx.doi.org/10.1038/s41467-023-38197-y}},
  doi          = {{10.1038/s41467-023-38197-y}},
  volume       = {{14}},
  year         = {{2023}},
}