Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 5, Issue 31, Pages 7871-7883Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc02369c
Keywords
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Funding
- National Natural Science Foundation of China [21572176, 20902072]
- Fundamental Research Funds for the Central Universities [cxtd2015003]
- China Postdoctoral Science Foundation [20130201110034, 2015M580831]
- Natural Science Foundation of Shaanxi Province [2016JQ2011]
- State Key Laboratory for Mechanical Behavior of Materials
- Hong Kong Research Grants Council [HKBU 12304715]
- Hong Kong Polytechnic University [1-ZE1C]
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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 (eta(L)) of 85.1 cd A(-1), corresponding to a power efficiency (eta(P)) of 69.7 lm W-1 and an external quantum efficiency (eta(ext)) of 28.1%.
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