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Efficient Green Phosphorescent Organic Light-Emitting Diodes Depending on Concentration of Lithium Quinolate in Electron Transport Layer
- Authors
- Kim, Bo Young; Lee, Seok Jae; Koo, Ja Ryong; Lee, Song Eun; Lee, Kum Hee; Yoon, Ju An; Kim, Woo Young; Yoon, Seung Soo; Kim, Young Kwan
- Issue Date
- Dec-2013
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Green Phosphorescent OLEDs; Quantum Efficiency; Triplet Exciton Confinement; Electron Transport Layer
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.13, no.12, pp.7998 - 8001
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 13
- Number
- 12
- Start Page
- 7998
- End Page
- 8001
- ISSN
- 1533-4880
- Abstract
- Systematic studies on carrier injection and transport are very important for achieving high efficiency in OLEDs. We demonstrate excellent green phosphorescent organic light-emitting diodes (OLED) with lithium quinolate (Liq) doped in 1,3,5-tris(N-phenylbenzimidazole-2-yl) benzene (TPBi) as the electron transport layer (ETL). The doping concentration of Liq was varied from 0% to 10%. The optimized green phosphorescent OLED with 5% Liq in the ETL showed the best efficiencies, which were maximum luminous efficiency, power efficiency, and quantum efficiency of 65.76 cd/A, 57.39 lm/W, and 20.03%, respectively. Moreover, high triplet energy states of TCTA and TPBi as a triplet exciton-blocking layer (TEBL) played a role in efficient exciton confinement.
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Related Researcher
- Kim, Young Kwan
- Engineering (Applied Science)