title: 1,3,4-Oxadiazole containing silanes as novel hosts for blue phosphorescent organic light emitting diodes.
abstract: Five rigid oxadiazole (OXD) containing silanes, denoted 1-5, have been developed with high morphological stability. Disruption of the π-aromatic conjugation by introduction of Si atoms leads to a large band gap and high triplet energy. Among the OXDs we studied, 2,5-bis(triphenylsilylphenyl)-1,3,4-oxadiazole 5 is the best host for FIrpic, with a phosphorescent organic light emitting diode (PHOLED) turn-on voltage of 6.9 V, maximum luminance of 5124 cd/m(2), current efficiency of 39.9 cd/A, and external quantum efficiency of 13.1%. Special molecular stacking in the single crystal of 5 was discussed.
authors.affiliation: Department of Chemisty, National Taiwan University, 1 Roosevelt Road Section 4, Taipei 106, Taiwan, R.O.C. mkleung@ntu.edu.tw
authors.forename: Man-kit
authors.initials: MK
authors.lastname: Leung
authors.forename: Wan-Hsi
authors.initials: WH
authors.lastname: Yang
authors.forename: Ching-Nan
authors.initials: CN
authors.lastname: Chuang
authors.forename: Jiun-Haw
authors.initials: JH
authors.lastname: Lee
authors.forename: Chi-Feng
authors.initials: CF
authors.lastname: Lin
authors.forename: Mao-Kuo
authors.initials: MK
authors.lastname: Wei
authors.forename: Yu-Hao
authors.initials: YH
authors.lastname: Liu