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Key host parameters for long lifetimes in phosphorescent organic light-emitting diodes: bond dissociation energy in triplet excited state

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Abstract

Key parameters of the host for long lifetimes in phosphorescent organic light-emitting diodes were investigated by synthesizing three isomeric hosts with a carbazolylcarbazole hole transport moiety and a benzonitrile electron transport moiety. The position of the CN unit was controlled as the ortho, meta and para position to the carbazolylcarbazole to study the relationship between material parameters and lifetime of the phosphorescent organic light-emitting diodes. It was revealed that the bond dissociation energy in the triplet excited state is well-correlated with the device lifetime of the phosphorescent organic light-emitting diodes.

Graphical abstract: Key host parameters for long lifetimes in phosphorescent organic light-emitting diodes: bond dissociation energy in triplet excited state

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Article information


Submitted
13 Oct 2019
Accepted
11 Dec 2019
First published
13 Dec 2019

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

Key host parameters for long lifetimes in phosphorescent organic light-emitting diodes: bond dissociation energy in triplet excited state

C. Y. Yang, S. Kang, H. Jeong, H. J. Jang, Y. Lee and J. Y. Lee, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05585A

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