| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 분자전자 부문위원회 |
| 제목 | Improvement of electroluminescent efficiency by inserting interfacial exciton blocking layerin electrophosphorescent organic light emitting diodes |
| 초록 | Phosphorescent organic light emitting diodes (OLEDs) have been spotlighted for the possibility of achieving nearly 100% internal efficiency and it was proven in green emitting devices1. The quantum efficiency of blue phosphorescent OLED, however, is lower than green. One of the reasons is the not-adequate confinement of triplet exciton in the emitting dye due to the lower triplet energy of host material and hole transporting layer (HTL) than that of the phosphorescent dye2. In this presentation, we report on the improved quantum efficiency of blue electrophosphorescent OLED by inserting an interfacial exciton blocking layer, where iridium(III)bis[(4,6-di-fluorophen-yl)-pyridinato-N,C2']picolinate (FIrpic) was as the blue phosphorescent electro-luminescent dye. A newly synthesized bipolar material, JHK6-3 with carbazole and electron transporting group, was used as the interfacial layer and also as the host for the dye, resulting in drastic increase in external quantum efficiency. 참고문헌 1. C. Adachi, M. A. Baldo, M. E. Thompson, and S. R. Forrest, J. Appl. Phys., 90, 5048(2001) 2. R. J. Holmes, B. W. D’Andrade, S. R. Forrest, X. Ren, J. Li, and M. E. Thompson, Appl. Phys. Lett., 83, 3818(2003) |
| 저자 | 김지환, 김주현, 윤도영, 김장주 |
| 소속 | 서울대 |
| 키워드 | OLED; phosphorescent; efficiency; interfacial excition blocking layer |
