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Acceptor Modulation for Improving Spiro-Type Thermally Activated Delayed Fluorescence Emitter

Abstract

A novel donor (D)-spiro-acceptor (A) emitter 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). Combined with 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 obvious TADF characteristic of SAF-3CN in the doped films. Encouragingly, the device performance reaches 19.4% external quantum efficiency (EQE) and small roll-off, which is better than ACRFLCN and closes to the best performance in this system.

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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, Accepted Manuscript
Article type
Paper

Acceptor Modulation for Improving 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, Accepted Manuscript , DOI: 10.1039/D0TC00743A

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