title: Novel four-pyridylbenzene-armed biphenyls as electron-transport materials for phosphorescent OLEDs.
abstract: A series of four-pyridylbenzene-armed biphenyl derivatives were designed and synthesized as an electron-transport and exciton- and hole-block layer for the fac-tris(2-phenylpyridine)iridium (Ir(PPy)3)-based green phosphorescent organic light-emitting devices (OLEDs), giving improved efficiency in comparison to that with both the electron-transport layer of tris(8-hydroxyquinoline)aluminum (Alq3) and the exciton- and hole-block layer of 2,9-dimethyl-4,7-diphenylphenathroline (BCP).
authors.affiliation: Optoelectronic Industry and Technology Development Association, Bunkyo-ku, Tokyo 112-0014, Japan. sushijian@hotmail.com
authors.forename: Shi-Jian
authors.initials: SJ
authors.lastname: Su
authors.forename: Daisaku
authors.initials: D
authors.lastname: Tanaka
authors.forename: Yan-Jun
authors.initials: YJ
authors.lastname: Li
authors.forename: Hisahiro
authors.initials: H
authors.lastname: Sasabe
authors.forename: Takashi
authors.initials: T
authors.lastname: Takeda
authors.forename: Junji
authors.initials: J
authors.lastname: Kido