Journal
INORGANIC CHEMISTRY
Volume 55, Issue 4, Pages 1720-1727Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.5b02625
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Funding
- Tengfei Project from Xi'an Jiaotong University
- Fundamental Research Funds for the Central Universities
- Program for New Century Excellent Talents in University
- Ministry of Education of China [NECT-09-0651]
- Key Creative Scientific Research Team in Shaanxi Province [2013KCT-05]
- China Postdoctoral Science Foundation [20130201110034]
- National Natural Science Foundation of China [20902072, 21572176]
- Areas of Excellence Scheme of the University Grants Committee [AoE/P-03/08]
- National Basic Research Program of China [2013CB834702]
- Science, Technology and Innovation Committee of Shenzhen Municipality [JCYJ20140419130507116]
- Hong Kong Research Grants Council [HKBU203313]
- Hong Kong Baptist University [FRG2/13-14/083]
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Phosphorescent dinuclear iridium(III) complexes that can show high luminescent efficiencies and good electroluminescent abilities are very rare. In this paper, highly phosphorescent 2-phenylpyrimidine-based dinuclear iridium(III) complexes have been synthesized and fully characterized. Significant differences of the photophysical and electrochemical properties between the mono- and dinuclear complexes are observed. The theoretical calculation results show that the dinuclear complexes adopt a unique molecular orbital spatial distribution pattern, which plays the key role of determining their photophysical and electrochemical properties. More importantly, the solution-processed organic light-emitting diode (OLED) based on the new dinuclear iridium(III) complex achieves a peak external quantum efficiency (eta(ext)) of 14.4%, which is the highest eta(ext), for OLEDs using dinuclear iridium(III) complexes as emitters. Besides, the efficiencies of the OLED based on the dinuclear iridium(III) complex are much higher that those of the OLED based on the corresponding mononuclear iridium(III) complex.
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