title: High contrast blue organic light-emitting diodes using inorganic multilayers of Al and ZnSe.
abstract: High contrast blue organic light-emitting diodes were fabricated using an inorganic multilayer of NPB (700 Å)/MADN (200 Å)/Alq3 (300 Å)/LiF (10 Å)/Al (70 Å)/ZnSe (300 Å)/Al (1000 Å). The optical and electrical characteristics were measured and compared to conventional organic light-emitting devices (OLEDs) and OLEDs with polarizers. OLEDs with the metal multilayer cathodes had an improved contrast ratio of 135∶1 compared to 104∶1 for OLEDs with polarizers. In addition, the multilayer OLEDs had a low turn-on voltage of 3.5 V due to energy band fitting of ZnSe with Al and the electron transport layer.
authors.affiliation: Green Energy Semiconductor Engineering, Hoseo University, Asan 330-713, South Korea.
authors.forename: You-Hyun
authors.initials: YH
authors.lastname: Kim
authors.forename: Sang Youn
authors.initials: SY
authors.lastname: Lee
authors.forename: Wook
authors.initials: W
authors.lastname: Song
authors.forename: Mei
authors.initials: M
authors.lastname: Meng
authors.forename: Richard
authors.initials: R
authors.lastname: Wood
authors.forename: Peter
authors.initials: P
authors.lastname: Mascher
authors.forename: Dae Hyun
authors.initials: DH
authors.lastname: Ryu
authors.forename: Woo Young
authors.initials: WY
authors.lastname: Kim