한국정보디스플레이학회:학술대회논문집
- 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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- Pages.1654-1657
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- 2007
Low roll-off of efficiency with increasing current density in phosphorescent OLEDs
- Kang, Jae-Wook (School of Materials Science and Engineering, and OLED Center, Seoul National University) ;
- Lee, Se-Hyung (School of Materials Science and Engineering, and OLED Center, Seoul National University) ;
- Park, Hyung-Dol (School of Materials Science and Engineering, and OLED Center, Seoul National University) ;
- Jeong, Won-Ik (School of Materials Science and Engineering, and OLED Center, Seoul National University) ;
- Yoo, Kyung-Mo (School of Materials Science and Engineering, and OLED Center, Seoul National University) ;
- Park, Young-Seo (School of Materials Science and Engineering, and OLED Center, Seoul National University) ;
- Kim, Jang-Joo (School of Materials Science and Engineering, and OLED Center, Seoul National University)
- 발행 : 2007.08.27
초록
We demonstrate that the reduction of quantum efficiency with increasing current density in phosphorescent light emitting diodes (PhOLEDs) is related to the formation of excitons in hole transporting layer based on the analysis of emission spectra and exciton formation zone. By employing dual emitting layerm we could achieve maintaining quantum efficiency at high current density up to