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Enhanced Efficiency and Reduced Roll-off in Blue and White Phosphorescent Organic Light-Emitting Diodes with a Mixed Host Structure
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- Authors
- Jong Hee Lee, Jeong Ik Lee, Jun Yeob Lee, Hye Yong Chu
- Issue Date
- 2009-05
- Citation
- Applied Physics Letters, v.94, no.19, pp.193305-1-193305-3
- ISSN
- 0003-6951
- Publisher
- American Institute of Physics (AIP)
- Language
- English
- Type
- Journal Article
- Project Code
- 08IB3200, 고효율 백색 OLED 소자 기술 개발, Chu Hye Yong
- Abstract
- 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 Keywords
- 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)