Solution Processed Red Phosphorescent Organic Light-Emitting Diodes with Green Phosphorescent Ir Sensitizer
- Authors
- Seo, Ji Hyun; Choi, Eun Young; Kim, Hoe Min; Kim, Young Kwan; Kim, Seul Ong; Lee, Kum Hee; Yoon, Seung Soo; Je, Jong-Tae
- Issue Date
- 2011
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- Cascade energy transfer; organic light-emitting diode; sensitizer
- Citation
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.538, pp.91 - 97
- Journal Title
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS
- Volume
- 538
- Start Page
- 91
- End Page
- 97
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/20627
- DOI
- 10.1080/15421406.2011.563657
- ISSN
- 1542-1406
- Abstract
- We fabricated the organic light-emitting diodes (OLEDs) with sensitizer by solution process. The addition of sensitizer into the emission layer improved the device efficiency. 4,4'-N,N'-dicarbazole-biphenyl (CBP), bis(2-phenylquinoline) iridium(III) (acetylacetonate) [Ir(pq)(2)(acac)], tris(2-phenylpyridine) iridium [Ir(ppy)(3)] were used as host, red emitting dopant, and sensitizer, respectively. The sensitizer leads to the cascade energy transfer from the host into the red emitting dopant. The doping concentration of sensitizer was varied as 0 similar to 20 wt% and optimized. As a result, the device with 5% Ir(ppy)(3) shows the luminous efficiency, power efficiency, and quantum efficiency of 5.1 cd/A, 4.0 lm/W, and 3.0%, respectively. These efficiencies are about 3 times as high as that of device without sensitizer.
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Collections - College of Engineering > Department of Science > 1. Journal Articles
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