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Hybrid spacer for high-efficiency white organic light-emitting diodes
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High-efficient white organic light-emitting diodes (WOLEDs) were fabricated by using the following three different emitting materials:-(2,2-diphenylvinyl)-1-[4-(-diphenylamino)-styryl]-terphenyl for blue emission, fac-tris(2-phenypyridine) iridium(III) for green emission, and bis(5-benzoyl-2-phenylpyridinato-)iridium(III) (acetylacetonate) for red emission. For higher efficiency, a hybrid spacer (HS) was inserted between each emissive layer (blue-red, red-green, and green-blue emissive layers). It was found that the WOLEDs using HS showed maximum power efficiency of , maximum external quantum efficiency of 13.1%, and Commission Internationale de I’Eclairage coordinates of .
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