Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1443292 | Synthetic Metals | 2009 | 4 Pages |
Abstract
We report high efficiency phosphorescent white organic light-emitting devices (WOLEDs) employing single emissive layer (EML) based on an ultra wide band-gap host. Effective exciton/charge confinement and balanced recombination within EML was achieved by employing adequate interlayer and stepwise hole-transporting layer (step HTL) system. Moreover, this step HTL system lower driving voltage of WOLEDs, therefore power efficiency was enhanced over 40%. These WOLEDs showed external quantum, and power efficiencies of 17.6%, and 37.5 lm/W at 100 cd/m2 without outcoupling enhancements. We also found that these WOLEDs exhibited little change of color coordinate from 100 to 10,000 cd/m2.
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Authors
Jonghee Lee, Jeong-Ik Lee, Hye Yong Chu,