1. Low voltage and very high efficiency deep-blue phosphorescent organic light-emitting devices.
- Author
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Sang-Hyun Eom, Ying Zheng, Chopra, Neetu, Lee, Jaewon, So, Franky, and Jiangeng Xue
- Subjects
PHOSPHORESCENCE ,RADIOACTIVITY ,LIGHT emitting diodes ,ELECTROLUMINESCENT devices ,EXCITON theory ,QUANTUM theory ,ABSORPTION spectra - Abstract
We report on very high efficiency deep-blue phosphorescent organic light-emitting devices (PHOLEDs) based on iridium(III) bis(4
′ ,6′ -difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate (FIr6). Dual emissive layers consisting of an N,N′ -dicarbazolyl-3,5-benzene layer doped with 4 wt % FIr6 and a p-bis(triphenylsilyly)benzene layer doped with 25 wt % FIr6 were employed to maximize exciton generation on FIr6 molecules. Combined with the p-i-n device structure, we achieved a low turn-on voltage of 3.2 V and very high power efficiencies of 25±2 lm/W at 100 cd/m2 and 20±2 lm/W at 1000 cd/m2 for such deep-blue PHOLEDs with peak emission at a wavelength of 458 nm. [ABSTRACT FROM AUTHOR]- Published
- 2008
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