title: Cool white light-emitting three stack OLED structures for AMOLED display applications.
abstract: This paper demonstrates 2-stack and 3-stack white organic light-emitting diodes (WOLEDs) with fluorescent blue and phosphorescent yellow emissive units. The 2-stack and 3-stack WOLED comprises blue-yellow and blue-blue-yellow (blue-yellow-blue) combinations. The position of the yellow emitter and possible cavity lengths in different stack architectures are theoretically and experimentally investigated to reach Commission Internationale de L'Eclairage (CIE) coordinates of near (0.333/0.333). Here, a maximum external quantum efficiency (EQE) of 23.6% and current efficiency of 62.2 cd/A at 1000 cd/m2as well as suitable CIE color coordinates of (0.335/0.313) for the blue-blue-yellow 3-stack hybrid WOLED structure is reported. In addition, the blue-yellow-blue 3-stack architecture exhibits an improved angular dependence compared to the blue-blue-yellow structure at a decreased EQE of 19.1%.
authors.forename: Ramon
authors.initials: R
authors.lastname: Springer
authors.forename: Byoung Yeop
authors.initials: BY
authors.lastname: Kang
authors.forename: Raju
authors.initials: R
authors.lastname: Lampande
authors.forename: Dae Hyun
authors.initials: DH
authors.lastname: Ahn
authors.forename: Simone
authors.initials: S
authors.lastname: Lenk
authors.forename: Sebastian
authors.initials: S
authors.lastname: Reineke
authors.forename: Jang Hyuk
authors.initials: JH
authors.lastname: Kwon