P‐218: High‐Efficiency White Organic Light‐Emitting Diodes Using Hybrid‐Spacer

Abstract The authors have demonstrated high‐efficient white organic light‐emitting diodes (WOLEDs) using three‐emitting materials, 4″‐(2,2‐diphenylvinyl)‐1‐[4‐(N,N‐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‐2‐phenylpyridinato‐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 (CIE x,y ) coordinates of (x=0.37, y=0.37), respectively.