title: The inductive-effect of electron withdrawing trifluoromethyl for thermally activated delayed fluorescence: tunable emission from tetra- to penta-carbazole in solution processed blue OLEDs.
abstract: The non-conjugated inductive effect of trifluoromethyl (CF3) was found to be a new acceptor instead of other conjugated moieties. Two blue emissive compounds, 4CzCF3Ph and 5CzCF3Ph, were synthesized using a simple catalyst-free C-N coupling reaction. Solution-processed TADF devices based on the 5CzCF3Ph dopant exhibit significantly higher efficiency (11.8 cd A(-1), 5.2%) than 4CzCF3Ph (1.03 cd A(-1), 0.67%) due to the smaller ΔE(ST) value for efficient RISC.
authors.affiliation: Key Lab for Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, P. R. China. iamyttao@njtech.edu.cn iamwhuang@njtech.edu.cn.
authors.forename: Ling
authors.initials: L
authors.lastname: Mei
authors.forename: Jia
authors.initials: J
authors.lastname: Hu
authors.forename: Xudong
authors.initials: X
authors.lastname: Cao
authors.forename: Fangfang
authors.initials: F
authors.lastname: Wang
authors.forename: Chao
authors.initials: C
authors.lastname: Zheng
authors.forename: Youtian
authors.initials: Y
authors.lastname: Tao
authors.forename: Xinwen
authors.initials: X
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Huang