title: Asymmetrical fluorene[2,3-b]benzo[d]thiophene derivatives: synthesis, solid-state structures, and application in solution-processable organic light-emitting diodes.
abstract: A series of novel asymmetrical fused compounds containing the backbone of fluorene[2,3-b]benzo[d]thiophene (FBT) were effectively synthesized and fully characterized. Single-crystal X-ray studies demonstrated that the length of the substituent side chains greatly affects the solid-state packing of the obtained fused compounds. DFT, photophysical, and electrochemical studies all showed that the FBTs have large band gaps, low-lying HOMO energy levels, and therefore good stability toward oxidation. Moreover, the substituents strongly influence the fluorescence properties of the resulting FBT derivatives. The di-n-hexyl compound exhibits intense fluorescence in solution with the highest quantum yield of up to 91 %. Solution-processed green phosphorescent organic light-emitting diodes with the di-n-butyl derivative as the host material exhibited a maximum brightness of 14,185 cd m(-2) and a luminescence efficiency of 12 cd A(-1).
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Organic Solids Laboratory, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Du
authors.forename: Shanghui
authors.initials: S
authors.lastname: Ye
authors.forename: Jianming
authors.initials: J
authors.lastname: Chen
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Guo
authors.forename: Yunqi
authors.initials: Y
authors.lastname: Liu
authors.forename: Kun
authors.initials: K
authors.lastname: Lu
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Ting
authors.initials: T
authors.lastname: Qi
authors.forename: Xike
authors.initials: X
authors.lastname: Gao
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Shuai
authors.forename: Gui
authors.initials: G
authors.lastname: Yu