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

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 the dimesityboron group and auxiliary ligand containing other main-group element units showing unique charge injection/transporting features. Their thermal stability, photophysical and electrochemical properties, as well as 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% at room temperature. Moreover, the solution-processed organic light-emitting devices (OLEDs) using these asymmetric complexes as orange emitters can show very high EL efficiencies with the maximum luminance efficiency (ηL) of 85.1 cd A−1, corresponding to power efficiency (ηP) of 69.7 lm W−1 and external quantum efficiency (ηext) of 28.1%.

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Publication details

The article was received on 30 May 2017, accepted on 06 Jul 2017 and first published on 10 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02369C
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Novel iridium(III) complexes bearing dimesityboron group with nearly 100% phosphorescent quantum yields for highly efficient organic light-emitting diodes

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

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