title: New amorphous hole blocking materials for high efficiency OLEDs.
abstract: Two new amorphous molecular materials, 2,5-bis(2',5'-dimethyl-4-triphenylsilyl-phenyl)-[1,3,4]oxadiazole (BDTSO) and 2,5-bis(2',5'-dimethyl-4-triphenylsilyl-phenyl)-[1,3,4]thiadiazole (BDTST) were synthesized and investigated as hole blocking materials (HBM) for organic light-emitting diodes. The efficiency of electroluminescent device was improved by using BDTSO instead of BAlq. The current and power efficiency of the device using BDTSO as HBM is 39.6 cd/A and 13.1 lm/W at 10 mA/cm2, respectively, which is higher compared to the same values for devices using BDTST and BAq which are typically used as HBM.
authors.affiliation: School of Materials Science and Engineering and ERI, Gyeongsang National University, Jinju, 660-701, Korea.
authors.forename: Sung Ouk
authors.initials: SO
authors.lastname: Jung
authors.forename: Jong-Won
authors.initials: JW
authors.lastname: Park
authors.forename: Dong Min
authors.initials: DM
authors.lastname: Kang
authors.forename: Jeong-Sik
authors.initials: JS
authors.lastname: Kim
authors.forename: Sung-Jin
authors.initials: SJ
authors.lastname: Park
authors.forename: Pengtao
authors.initials: P
authors.lastname: Kang
authors.forename: Hyoung-Yun
authors.initials: HY
authors.lastname: Oh
authors.forename: Jung-Hwan
authors.initials: JH
authors.lastname: Yang
authors.forename: Yun-Hi
authors.initials: YH
authors.lastname: Kim
authors.forename: Soon-Ki
authors.initials: SK
authors.lastname: Kwon