期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 784, 期 -, 页码 31-40出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2014.05.003
关键词
Iridium(III) complexes; Phosphorescence; 2-Phenylimidazo[1,2-a]pyridine; Organic light-emitting diodes; Electroluminescence
资金
- Tengfei Project from Xi'an Jiaotong University
- Key Creative Scientific Research Team in Shannxi Province [2013KCT-05]
- China Postdoctoral Science Foundation [20130201110034]
- Fundamental Research Funds for the Central Universities
- National Natural Science Foundation of China [20902072, 51373145]
- Program for New Century Excellent Talents in University
- Ministry of Education of China [NECT-09-0651]
- National Basic Research Program of China (973 Program) [2013CB834702]
- Hong Kong Baptist University [FRG2/13-14/083]
- Hong Kong Research Grants Council [HKBU202410, HKUST2/CRF/10]
- University Grants Committee of HKSAR, China [AoE/P-03/08]
- Partner State Key Laboratory of Environmental and Biological Analysis and Strategic Development Fund of HKBU
New iridium(III) cyclometalated complexes based on 2-phenylimidazo[1,2-a]pyridine-type ligands were synthesized and their photophysical, electrochemical and electroluminescent (EL) properties were investigated. The detailed insight into the characters of the emissive excited states was obtained by frontier molecular orbital analysis. These metal complexes exhibit very balanced charge transporting ability for both kinds of charge carriers, which can furnish decent EL performance in the phosphorescent organic light-emitting devices (PHOLEDs) with peak luminance of 15491 cd m(-2) at ca. 13.5 V, external quantum efficiency of 6.81%, luminance efficiency of 34.74 cd A(-1), and power efficiency of 17.54 lm W-1. These results not only provide a better understanding of the inherent characters of Ir-III phosphors with phenylimidazo[1,2-a]pyridine units, but also valuable information on future molecular design of triplet emitters with unique electronic features for high-performance PHOLEDs. (C) 2014 Elsevier B. V. All rights reserved.
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