title: A versatile efficient one-step approach for carbazole-pyridine hybrid molecules: highly efficient host materials for blue phosphorescent OLEDs.
abstract: By using various fluoro-substituted pyridines and carbazole as starting materials, we have synthesized a series of carbazole-pyridine hybrid compounds through an efficient catalyst free C-N coupling reaction with high yields of 85-95%. The bi-, tri- and tetra-carbazole substituted pyridine derivatives exhibit increased thermal stabilities and comparatively high triplet energy levels of ∼3.0 eV. By using them as host materials for blue phosphorescent OLEDs, maximum current efficiencies are achieved ranging from 32-42 cd A(-1).
authors.affiliation: Key Laboratory for Flexible Electronics, Institute of Advanced Materials (IAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, P.R. China. iamyttao@njtech.edu.cn iamwhuang@njtech.edu.cn.
authors.forename: Chao
authors.initials: C
authors.lastname: Tang
authors.forename: Ran
authors.initials: R
authors.lastname: Bi
authors.forename: Youtian
authors.initials: Y
authors.lastname: Tao
authors.forename: Fangfang
authors.initials: F
authors.lastname: Wang
authors.forename: Xudong
authors.initials: X
authors.lastname: Cao
authors.forename: Shifan
authors.initials: S
authors.lastname: Wang
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhong
authors.forename: Hongmei
authors.initials: H
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Huang