title: Improvements of phosphorescent white OLEDs performance for lighting application.
abstract: We developed white OLED device with high power efficiency, in which blue and orange phosphorescent emitters were used. By introduction of multi-functional interlayer which has partial doping of orange dopant inside EBL, we report WOLEDs with peak external efficiencies up to (14.1% EQE, 31.3 Im/W) without light out-coupling technique. At 1000 cd/m2, the performance achieved was 11.9% EQE, 18.7 Im/W with CIE = (0.39, 0.44). We also found that WOLED performances are related with doping ratio of the orange dopant that was inserted inside EBL.
authors.affiliation: IT Convergence and Components Laboratory, Electronics and Telecommunications Research Institute, Daejeon, 305-350, Korea.
authors.forename: Jonghee
authors.initials: J
authors.lastname: Lee
authors.forename: Hye Yong
authors.initials: HY
authors.lastname: Chu
authors.forename: Jeong-Ik
authors.initials: JI
authors.lastname: Lee
authors.forename: Ki-Im
authors.initials: KI
authors.lastname: Song
authors.forename: Su Jin
authors.initials: SJ
authors.lastname: Lee