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Issue 31, 2017
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Novel iridium(iii) complexes bearing dimesitylboron groups with nearly 100% phosphorescent quantum yields for highly efficient organic light-emitting diodes

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Abstract

A series of cyclometalated iridium(III) complexes, Ir-B-1, Ir-B-2, Ir-B-3, and Ir-B-4, were synthesized with the 2-phenylpyridine (ppy) type main ligand possessing a dimesitylboron group and the auxiliary ligand containing other main-group element units showing unique charge injection/transporting features. Their thermal stability, photophysical and electrochemical properties, and electroluminescent (EL) performances have been characterized. Time-dependent density functional theory (TD-DFT) calculations were carried out to study the photophysical properties of these complexes. All these complexes can emit intense orange phosphorescence with extremely high quantum yields of nearly 100% measured in neat films at room temperature. Moreover, the solution-processed organic light-emitting devices (OLEDs) using these complexes as orange emitters can show very high EL efficiencies with the maximum luminance efficiency (ηL) of 85.1 cd A−1, corresponding to a power efficiency (ηP) of 69.7 lm W−1 and an external quantum efficiency (ηext) of 28.1%.

Graphical abstract: Novel iridium(iii) complexes bearing dimesitylboron groups with nearly 100% phosphorescent quantum yields for highly efficient organic light-emitting diodes

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Supplementary files

Article information


Submitted
30 May 2017
Accepted
06 Jul 2017
First published
10 Jul 2017

J. Mater. Chem. C, 2017,5, 7871-7883
Article type
Paper

Novel iridium(III) complexes bearing dimesitylboron groups with nearly 100% phosphorescent quantum yields for highly efficient organic light-emitting diodes

B. Liu, F. Dang, Z. Feng, Z. Tian, J. Zhao, Y. Wu, X. Yang, G. Zhou, Z. Wu and W. Wong, J. Mater. Chem. C, 2017, 5, 7871
DOI: 10.1039/C7TC02369C

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