title: High-efficiency orange and tandem white organic light-emitting diodes using phosphorescent dyes with horizontally oriented emitting dipoles.
abstract: Tandem white organic light-emitting diodes (WOLEDs) using horizontally oriented phosphorescent dyes in an exciplex-forming co-host are presented, along with an orange OLED. A high external quantum efficiency of 32% is achieved for the orange OLED at 1000 cd m(-2) and the tandem WOLEDs exhibit a high maximum EQE of 54.3% (PE of 63 lm W(-1)).
authors.affiliation: WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea.
authors.forename: Sunghun
authors.initials: S
authors.lastname: Lee
authors.forename: Hyun
authors.initials: H
authors.lastname: Shin
authors.forename: Jang-Joo
authors.initials: JJ
authors.lastname: Kim
keywords: dyes; organic light-emitting diodes (OLEDs); phosphorescence; white OLEDs (WOLEDs)