期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 694, 期 19, 页码 3050-3057出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2009.05.037
关键词
Phosphorescence; Iridium diazine complex; (MLCT)-M-3; OLED
资金
- National Nature Science Foundation of China [20474003, 90401028]
- 973 Program [2002CB613405]
The synthesis and luminescence of four new iridium (III) diazine complexes (1-4) were investigated. HOMO and LUMO energy levels of the complexes were estimated according to the electrochemical performance and the UV-Vis absorption spectra, showing the pyrimidine complexes have a larger increase for the LUMO than the HOMO orbital in comparison with the pyrazine complexes. Several high-efficiency yellow and green OLEDs based on phosphorescent iridium (III) diazine complexes were obtained. The devices emitting yellow light based on 1 with turn-on voltage of 4.1 V exhibited an external quantum efficiency of 13.2% (power efficiency 20.3 lm/W), a maximum current efficiency of 37.3 cd/A. The electroluminescent performance for the green iridium pyrimidine complex of 3 is comparable to that of the iridium pyridine complex (PPY)(2)Ir(acac) (PPY = 2-phenylpyridine), which is among the best reported. (C) 2009 Elsevier B.V. All rights reserved.
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