title: Novel oligo-9,9'-spirobifluorenes through ortho-linkage as full hydrocarbon host for highly efficient phosphorescent OLEDs.
abstract: 4-Bromo-9,9'-spirobifluorene is facilely synthesized, and from this precursor, two ortho-linked oligo-9,9'-spirobifluorenes, 44BSF and 24TSF, are constructed. Devices with 24TSF as the full-hydrocarbon host material and Ir(ppy)(3) or (ppq)(2)Ir(acac) as the triplet emitter show maximum external quantum efficiencies of 12.6 and 10.5% for green and red electrophosphorescence, respectively.
authors.affiliation: Department of Chemistry, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, PR China.
authors.forename: Zuoquan
authors.initials: Z
authors.lastname: Jiang
authors.forename: Haiqing
authors.initials: H
authors.lastname: Yao
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Zhang
authors.forename: Chuluo
authors.initials: C
authors.lastname: Yang
authors.forename: Zhongyin
authors.initials: Z
authors.lastname: Liu
authors.forename: Youtian
authors.initials: Y
authors.lastname: Tao
authors.forename: Jingui
authors.initials: J
authors.lastname: Qin
authors.forename: Dongge
authors.initials: D
authors.lastname: Ma