High-efficiency white organic light-emitting diodes using hybrid-spacer

초록

The authors have demonstrated high-efficient while organic light-emitting diodes (WOLEDs) using three-emitting materials, 4"(2,2-diphenylvinlyl)- 1-[4-(NN-diphenylamino)-styryl]-terphenyl (PVAS-tPh) as a blue emission, fac-tris(2-phenypyridine) iridium(III) (Ir(ppy)(3)) as a green emission, bis(5-benzoyl-2phenypyridinato-C N)iridium (III) (acetylacetonate) ((BZPPY)(2)Ir(III)acac) as a red emision. For higher efficiency, 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 28.69 lm/W, maximum external quantum efficiency of 13.1%, and Commission Internationale de I'Eclairage (CIEx,y) coordinates of (Y=0.37,y=0.37),respectively.

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