title: Hybrid host materials for highly efficient electrophosphorescence and thermally activated delayed fluorescence independent of the linkage mode.
abstract: Three non-conjugated hybrid host materials, tBu-OXD-o-L-TPA, tBu-OXD-m-L-TPA, and tBu-OXD-p-L-TPA, have been synthesized and characterized for their thermal, electrochemical, fluorescence, phosphorescence, and electroluminescence properties. Due to the non-conjugated spacer, the three hosts have a similar ETvalue as high as 2.71 eV, which is sufficiently high for blue phosphorescent and thermally activated delayed fluorescent (TADF) emitters. Different from the hosts with a direct linkage between a donor and an acceptor showing significantly distinct properties depending on linkage modes, the three new hosts demonstrate similar photophysical, electrochemical, and organic light-emitting device performances. Both phosphorescent and TADF devices with high efficiencies have been realized using all the three hosts. These results reveal a new merit of employing a non-conjugated spacer, which enables the synthesized hosts to show properties independent of the linkage mode. This might facilitate choosing materials with an economical synthesis process while not influencing their properties and thus enhance the potential of universal host materials.
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China. qiangwang@snnu.edu.cn.
authors.forename: Chao
authors.initials: C
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, University of Chinese Academy of Sciences, Changchun 130022, P. R. China.
authors.forename: Qingxun
authors.initials: Q
authors.lastname: Guo
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China. qiangwang@snnu.edu.cn.
authors.forename: Wujun
authors.initials: W
authors.lastname: Ma
authors.affiliation: College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, P. R. China.
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Li
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China. qiangwang@snnu.edu.cn.
authors.forename: Panlong
authors.initials: P
authors.lastname: Qiu
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China. qiangwang@snnu.edu.cn.
authors.forename: Jianyong
authors.initials: J
authors.lastname: Hu
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China. qiangwang@snnu.edu.cn.
authors.forename: Qiang
authors.identifier: http://orcid.org/0000-0002-4523-2206
authors.initials: Q
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, University of Chinese Academy of Sciences, Changchun 130022, P. R. China and Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China. msdgma@scut.edu.cn.
authors.forename: Jiangshan
authors.initials: J
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, University of Chinese Academy of Sciences, Changchun 130022, P. R. China and Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China. msdgma@scut.edu.cn.
authors.forename: Dongge
authors.initials: D
authors.lastname: Ma