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A negative polaron resistant p-type host for extended lifetime in deep blue phosphorescent organic light-emitting diodes

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Abstract

A novel mixed host employing a negative polaron stabilizing p-type host was developed to extend the device lifetime of blue phosphorescent organic light-emitting diodes (PhOLEDs). Instead of a conventional p-type host with only a hole transport unit, a p-type host with a negative polaron resistant unit in addition to the hole transport unit was used in the mixed host consisting of a p-type host and an n-type host. The p-type host had benzonitrile as a negative polaron resistant unit which stabilized the molecule under negative polarons. The use of the p-type host with the benzonitrile unit almost doubled the device lifetime of the blue PhOLEDs due to the improved negative polaron stability of the hosts. Therefore, the p-type host with the weak electron accepting benzonitrile unit can play the role of a lifetime extending p-type host to replace a conventional p-type host.

Graphical abstract: A negative polaron resistant p-type host for extended lifetime in deep blue phosphorescent organic light-emitting diodes

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Article information


Submitted
07 Dec 2019
Accepted
24 Feb 2020
First published
19 Mar 2020

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

A negative polaron resistant p-type host for extended lifetime in deep blue phosphorescent organic light-emitting diodes

C. Y. Yang, W. J. Chung, H. Jeong, Y. Lee and J. Y. Lee, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06702G

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