Novel four-pyridylbenzene-armed biphenyls as electron-transport materials for phosphorescent OLEDs.
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).
Su
Shi-Jian
SJ
Optoelectronic Industry and Technology Development Association, Bunkyo-ku, Tokyo 112-0014, Japan. sushijian@hotmail.com
Tanaka
Daisaku
D
Li
Yan-Jun
YJ
Sasabe
Hisahiro
H
Takeda
Takashi
T
Kido
Junji
J