title: C60/N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine:MoO3as the interconnection layer for high efficient tandem blue fluorescent organic light-emitting diodes.
abstract: The high efficient tandem blue fluorescent organic light emitting diodes (OLEDs) with the transparent interconnection layer (ICL) of fullerence (C60)/Molybdenum oxide (MoO3)-dopedN,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB) were presented. A stack consisting of 0.5 nm of LiF and 1 nm of Ca, which is located from C60to adjacent electron transporting layer is used as an electron injection layer. The experiment results indicate that the luminance of the tandem device is basically equal to that of the traditional single-unit device, but the current density of the tandem device is much less than that of the single-unit device under a same luminance. The current efficiency and the maximal power efficiency of tandem device with LiF/Ca/C60/NPB:MoO3/MoO3-based interconnection layer have been approximately enhanced by 250% and 126%, respectively. In addition, we also analyze that the mechanism of the efficiency enhancement is ascribed to the effective charge separation and transport of the ICL in tandem OLEDs.
authors.affiliation: Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Wu
authors.forename: Wentao
authors.initials: W
authors.lastname: Bi
authors.forename: Yulin
authors.initials: Y
authors.lastname: Hua
authors.forename: Jin'e
authors.initials: J
authors.lastname: Sun
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Xiao
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Shougen
authors.initials: S
authors.lastname: Yin