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Abstract
High-efficiency white organic light-emitting diodes(WOLEDs) were fabricated with two emissive layers and an blocking layer was sandwiched between two phosphorescent dopants, bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III(FIrpic) as the blue emission and a newly synthesized red phosphorescent material guest, bis(5-acetyl-2-phenylpyridinato-N,C2`) acetylacetonate(). This blocking layer prevented a T-T annihilation in a red emissive layer, and balanced with blue and red emission as blocking of hole carriers. The white device showed Commission Internationale d`Eclairage() coordinates of (0.317, 0.425) at 22400 , a maximum luminance of 27300 at 268 , a maximum luminous efficiency and power efficiency of 26.9 cd/A and 18.6 lm/W.
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