title: Asymmetric design of bipolar host materials with novel 1,2,4-oxadiazole unit in blue phosphorescent device.
abstract: The intrinsic asymmetry of 1,2,4-oxadiazole was utilized to synthesize three isomers, DCzmOXD-1, DCzmOXD-2, and mCzmOXD, and high triplet energies over 2.80 eV made them good candidates for host materials in blue OLEDs. The best efficiencies of 23.0 cd A(-1)/20.5 lm W(1-)/11.2% in CE/PE/EQE were achieved by DCzmOXD-1 with derivation at the β-carbon position of 1,2,4-oxadiazole.
authors.affiliation: Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, P.R. China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Lin-Song
authors.initials: LS
authors.lastname: Cui
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhong
authors.forename: Zuo-Quan
authors.initials: ZQ
authors.lastname: Jiang
authors.forename: Liang-Sheng
authors.initials: LS
authors.lastname: Liao