期刊
DYES AND PIGMENTS
卷 92, 期 1, 页码 603-609出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2011.04.017
关键词
Phosphorescent organic light emitting diodes; Iridium(III) complex; Trimethylsilyl xylene substituted ligands; Yellow-green emission; Reduced aggregation formation; High efficiency
资金
- MKE [10030814]
- KIAT
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2011-0000310]
We designed and synthesized a new iridium(111) complex with phenylpyridine ligands containing a bulky trimethylsilylxylene, 5-(2,5-dimethyl-4-(trimethylsilyl)phenyl)-2-phenylpyridine, by Suzuki coupling reaction and characterized using various spectroscopic studies. Nuclear magnetic resonance studies show its structure to be that of a facial isomer. Thermogravimetric analysis and differential scanning calorimetry studies show its higher thermal stability (Delta T-5%) of 638 K with a glass transition temperature of 425 K. It shows the photoluminescence emission at 532 nm in solution with the band gap energy of 2.56 eV. The new iridium(111) complex as dopant in phosphorescent organic light emitting diodes exhibits the yellow-green emission at 532 nm as it effectively hinders aggregation formation in the solid state at a dopant concentration of 6%, resulting in higher device efficiencies of 12.7% and 45.7 cd/A. The results show that the new iridium complex could be useful in white organic light emitting diodes for the lighting applications. (C) 2011 Published by Elsevier Ltd.
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