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Star-shaped thermally activated delayed fluorescence emitters with a tri-armed arylsulfonic acceptor for efficient solution processed organic light emitting diodes

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Abstract

A tri-armed arylsulfone-based acceptor (SF) linked by triphenylbenzene (TPB) has been developed to construct solution-processable thermally activated delayed fluorescence (TADF) materials with large band gaps. The acceptor suffered limited conjugation due to the tetrahedral geometry of sulfonyl groups, as well as a meta-linkage at the central TPB moiety. By simple conjugation of the SF with appropriate donor units, luminophores SF–DMAC and SF–PXZ capable of producing efficient blue/green emissions were obtained, with peak efficiencies of 11.3% (19.0 cd A−1 and 10.0 lm W−1) and 12.4% (35.6 cd A−1 and 17.8 lm W−1) in the corresponding wet-processed OLEDs. Decent resistance to roll-off at high brightness was noticed in the device based on SF–PXZ, ascribing to reduced intermolecular interactions due to its star-shaped architecture and an efficient reverse intersystem crossing (RISC) process.

Graphical abstract: Star-shaped thermally activated delayed fluorescence emitters with a tri-armed arylsulfonic acceptor for efficient solution processed organic light emitting diodes

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Supplementary files

Article information


Submitted
26 Dec 2019
Accepted
27 Feb 2020
First published
28 Feb 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Star-shaped thermally activated delayed fluorescence emitters with a tri-armed arylsulfonic acceptor for efficient solution processed organic light emitting diodes

R. Xiao, Y. Xiang, X. Cao, N. Li, T. Huang, C. Zhou, Y. Zou, G. Xie and C. Yang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC07049D

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