5-Isobutyryl-2-Phenylpyridine-Derived Iridium Complexes for Red Phosphorescent Light-Emitting Diodes
- Authors
- Lee, Kum Hee; Kim, Seul Ong; Seo, Ji Hyun; Kim, Young Kwan; Yoon, Seung Soo
- Issue Date
- May-2011
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Electroluminescence; Red Phosphorescence; Iridium Complex; 5-Isobutyryl-2-Arylpyridine Ligand
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.11, no.5, pp.4471 - 4475
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 11
- Number
- 5
- Start Page
- 4471
- End Page
- 4475
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/19895
- DOI
- 10.1166/jnn.2011.3696
- ISSN
- 1533-4880
- Abstract
- For the development of efficient red materials in organic light emitting diodes, a series of cyclometalated iridium complexes with 5-isobutyryl-2-arylpyridine-derived ligands were synthesized. Complexes 1-4 exhibited red phosphorescence with quantum yields of 0.16-0.48 in degassed CH2Cl2. An OLED device employing iridium complex 3 as a dopant exhibited the best performance with a maximum luminance of 35500 cd/m(2) at 14 V and luminance and power efficiencies of 15.5 cd/A and 6.23 Im/W at 20 mA/cm(2), respectively. In the device employing complex 2 as the dopant, the maximum luminance was 6300 cd/m(2) at 14 V and the maximum luminance efficiency and power efficiencies were 5.23 cd/A and 3.16 Im/W at 5.2 V, respectively, with CIE coordinates of (0.66, 0.32) at 9.0 V, close to the saturated red emission.
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