期刊
NEW JOURNAL OF CHEMISTRY
卷 39, 期 1, 页码 246-253出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nj01316f
关键词
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资金
- Major Research plan of the National Natural Science Foundation of China [91123034, 21005084, 20902066, 21402233]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09020201]
- National Science and Technology Ministry [2012BAF13B05-402]
- Natural Science Foundation of Jiangsu Province [BK2012631, BK20140387]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2012-skllmd-05]
As an extension of our previous study, three sky-blue homoleptic iridium(III) complexes 1-3 with fluorine-free phenylimidazole ligands were synthesized and their photophysical, electrochemical and thermal properties were studied. All the complexes showed high photoluminescence quantum yields ranging from 0.50 to 0.53. The introduction of a bulky isopropyl group at the 2,6-position of N-phenyl of the phenylimidazole ligands increases the quantum yield and the decomposition temperature of the iridium(III) complexes. As the conjugated system of the ligand becomes larger, a very small bathochromic-shift of 1 nm was observed in complex 3 (475 nm) compared with complexes 1 (474 nm) and 2 (474 nm). All the OLED devices showed high current efficiencies of over 20 cd A(-1) at the luminance of 1000 cd m(-2). Devices incorporated with complexes 1-3 all showed longer lifetime in comparison with that of a Flrpic-based device.
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