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Issue 25, 2020
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Acceptor modulation for improving a spiro-type thermally activated delayed fluorescence emitter

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Abstract

A novel donor (D)–spiro-acceptor (A) emitter, namely 10-phenyl-10H-spiro[acridine-9,9′-fluorene]-2′,4′,7′-tricarbonitrile (SAF-3CN), was synthesized for high efficiency, yellowish green third-generation thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs). The CN-modulation of the fluorene was adopted for the modification of the singlet state with minor modifications of the triplet state. Compared to the reference material 10-phenyl-10H-spiro[acridine-9,9′-fluorene]-2′,7′-dicarbonitrile (ACRFLCN), the electron-withdrawing –CN substituent on the C4 site of the fluorene results in a sufficiently small singlet–triplet energy gap (ΔEST) and obvious TADF characteristics of SAF-3CN in the doped films. Encouragingly, the device performance achieves an external quantum efficiency (EQE) of 19.4% and small roll-off, which is better than that of ACRFLCN and closer to the best performance in this system.

Graphical abstract: Acceptor modulation for improving a spiro-type thermally activated delayed fluorescence emitter

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Supplementary files

Article information


Submitted
13 Feb 2020
Accepted
20 May 2020
First published
20 May 2020

J. Mater. Chem. C, 2020,8, 8579-8584
Article type
Paper

Acceptor modulation for improving a spiro-type thermally activated delayed fluorescence emitter

X. Zhu, C. Peng, F. Kong, S. Yang, H. Li, S. Kumar, T. Wang, Z. Jiang and L. Liao, J. Mater. Chem. C, 2020, 8, 8579
DOI: 10.1039/D0TC00743A

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