한국정보디스플레이학회:학술대회논문집
- 2000.01a
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- Pages.125-126
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- 2000
Improved Efficiency of Polymer LEDs using Electron Transporting Layer
- Kim, Jong-Lae (Dept. of Fiber & Polymer Science, Seoul National University) ;
- Kim, Jai-Kyeong (Polymer Materials Laboratory, Korea Institute of Science and Technology) ;
- Cho, Hyun-Nam (Polymer Materials Laboratory, Korea Institute of Science and Technology) ;
- Kim, Dong-Young (Polymer Materials Laboratory, Korea Institute of Science and Technology) ;
- Hong, Sung-Il (Dept. of Fiber & Polymer Science, Seoul National University) ;
- Kim, Chung-Yup (Polymer Materials Laboratory, Korea Institute of Science and Technology)
- Published : 2000.01.13
Abstract
We report the use of fluorene based copolymers containing quinoline(POF66, PIF66) and pyridine(PFPV) units as electron transporting polymers for multi-layered LEDs. Double-layer device structure combining PIF66 as electron-transporting layer with the emissive MEHPPV showed a maximum quantum efficiency of 0.03%, which is 30 fold increased compared with ITO/MEHPPV/Al single-layer device. PFPV layer increased the quantum efficiency up to 0.1% in the device structure of ITO/(P-3:PVK)/PFPV/Al. The ETL with the electron deficient moiety improved the LED performance by the characteristics of electron transporting as well as hole blocking between emissive layer and metal cathode.
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