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Improved Performance of Blue Phosphorescent Organic Light-Emitting Diodes with a Mixed Host System
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- Authors
- Jong Hee Lee, Jeong Ik Lee, Jun Yeob Lee, Hye Yong Chu
- Issue Date
- 2009-12
- Citation
- Applied Physics Letters, v.95, no.25, pp.253304-1-253304-3
- ISSN
- 0003-6951
- Publisher
- American Institute of Physics (AIP)
- Language
- English
- Type
- Journal Article
- Abstract
- We have investigated a relationship between device performances and host properties in the emissive layer (EML) of iridium(III) bis(4??, 6?? -difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate doped blue phosphorescent organic light-emitting diodes (PHOLEDs). We found that the recombination zone as well as charge carrier injection properties of the EML could be systematically engineered through a mixed host system. Therefore, light-emitting performances of blue PHOLEDs were greatly improved with external quantum and power efficiencies of 20.5% and 43.5 lm/W at a luminance of 56 cd/ m2, respectively. © 2009 American Institute of Physics.
- KSP Keywords
- Carrier injection properties, Charge carrier injection, Host system, Improved performance, Recombination zone, blue PHOLEDs, blue phosphorescent organic light-emitting diodes, emissive layer(EL), light emitting diodes(LED), mixed host, organic light emitting diode(OLED)