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Novel four-pyridylbenzene-armed biphenyls as electron-transport materials for phosphorescent OLEDs
Shi-Jian Su1, Daisaku Tanaka, Yan-Jun Li
1Optoelectronic Industry and Technology Development Association, Bunkyo-ku, Tokyo 112-0014, Japan. sushijian@hotmail.com
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).
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