title: A versatile triphenylamine/fluoranthene-based derivative as a nondoped green-emitting, hole-transporting interlayer for electroluminescent devices.
abstract: A new triphenylamine-bridged fluoranthene derivative, 4-(7,10-diphenylfluoranthen-8-yl)-N-[4-(7,10-diphenylfluoranthen-8-yl)phenyl]-N-phenylaniline (BDPFPA), with a high glass transition temperature of 220 °C has been synthesized and characterized. BDPFPA is a highly fluorescent and versatile material that can be used as a nondoped green emitter and as a hole transporter. BDPFPA was used in a standard trilayer device as the emitting layer, which showed a low turn-on voltage (<3 V) and a high efficiency of 11.6 cd A(-1). The device also shows little efficiency roll-off at high brightness. For example, the efficiency can still be maintained at 11.4 cd  A(-1) (5.4 lm  W(-1)) at a brightness of 10,000 cd  m(-2). These results are among the best reported for nondoped fluorescent green organic light-emitting diodes. A simple bilayer device, in which BDPFPA serves as a hole-transporting layer, has a maximum power efficiency of 3.3 lm  W(-1) and the performance is nearly 40 % higher than that of an N,N'-bis(1-naphthyl)-N,N'- diphenyl-1,1'-biphenyl-4,4'-diamine (NPB)-based standard device.
authors.affiliation: Department of Chemistry, Shantou University, Guangdong 515063, PR China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Yuan
authors.forename: Guo-Qiang
authors.initials: GQ
authors.lastname: Zhang
authors.forename: Feng
authors.initials: F
authors.lastname: Lu
authors.forename: Qing-Xiao
authors.initials: QX
authors.lastname: Tong
authors.forename: Qing-Dan
authors.initials: QD
authors.lastname: Yang
authors.forename: Hin-Wai
authors.initials: HW
authors.lastname: Mo
authors.forename: Tsz-Wai
authors.initials: TW
authors.lastname: Ng
authors.forename: Ming-Fai
authors.initials: MF
authors.lastname: Lo
authors.forename: Zheng-Qing
authors.initials: ZQ
authors.lastname: Guo
authors.forename: Chuan
authors.initials: C
authors.lastname: Wu
authors.forename: Chun-Sing
authors.initials: CS
authors.lastname: Lee