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학술지 Enhanced Efficiency and Reduced Roll-off in Blue and White Phosphorescent Organic Light-Emitting Diodes with a Mixed Host Structure
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저자
이종희, 이정익, 이준엽, 추혜용
발행일
200905
출처
Applied Physics Letters, v.94 no.19, pp.193305-1-193305-3
ISSN
0003-6951
출판사
American Institute of Physics (AIP)
DOI
https://dx.doi.org/10.1063/1.3136861
협약과제
08IB3200, 고효율 백색 OLED 소자 기술 개발, 추혜용
초록
We report a significant enhancement and a reduced efficiency roll-off in blue and white phosphorescent organic light-emitting diodes (PHOLEDs) based on a mixed host structure. The combination of a hole-transport-type host and an electron-transport-type host as a mixed host emissive layer resulted in an effective charge carrier injection and distribution of the recombination zone, and therefore highly efficient blue PHOLEDs with peak external quantum and power efficiencies of 21.6% and 44.9 lm/W were achieved. Moreover, white PHOLEDs with a mixed host structure showed a power efficiency of 37 lm/W, which is over four times higher than 8.7 lm/W in a single host structure device at a luminance of 1000 cd/ m2. © 2009 American Institute of Physics.
KSP 제안 키워드
Charge carrier injection, Effective charges, Efficiency roll-off, Electron Transport, Hole transport, Organic light-emitting diodes(OLEDS), Power Efficiency, Recombination zone, Reduced efficiency, blue PHOLEDs, emissive layer(EL)