title: Highly Efficient Cuprous Complexes with Thermally Activated Delayed Fluorescence for Solution-Processed Organic Light-Emitting Devices.
abstract: Two mononuclear cuprous complexes [Cu(PNNA)(POP)]BF4 (1) and [Cu(PNNA)(Xantphos)]BF4 (2) (PNNA = 9,9-dimethyl-10-(6-(3-phenyl-1H-pyrazol-1-yl)pyridin-3-yl)-9,10-dihydroacridine, POP = bis[2-(dipenylphosphino)phenyl]ether, Xantphos =4,5-bis(diphenylphosphino)-9,9-dimethylxanthene), with intense bluish-green luminescence based on a new diimine ligand were designed and synthesized. Their structural, electrochemical, and photophysical properties were characterized by single-crystal X-ray analysis, cyclic voltammetry, temperature dependence of spectroscopy, time-dependent emission spectroscopy, etc. The complexes exhibit high photoluminescence quantum yields in doped films (up to 74.6%) at room temperature. Thermally activated delayed fluorescence based on intraligand charge transfer was observed by grafting a strong electron-donor moiety, 9,9-dimethylacridan, on the diimine ligand, which is supported by the density functional theory calculations on two complexes. Highly efficient solution-processed OLEDs based on these two complexes were fabricated, among which the electroluminescent device using 2 as dopant shows a peak external quantum efficiency of 7.42%, a peak current efficiency of 20.24 cd/A, and a maximum brightness of 5579 cd/m(2).
authors.affiliation: Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science , Fuzhou, Fujian 350002, People's Republic of China.|University of Chinese Academy of Sciences , Beijing, 100049, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Liang
authors.affiliation: Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science , Fuzhou, Fujian 350002, People's Republic of China.
authors.forename: Xu-Lin
authors.initials: XL
authors.lastname: Chen
authors.affiliation: Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science , Fuzhou, Fujian 350002, People's Republic of China.|University of Chinese Academy of Sciences , Beijing, 100049, China.
authors.forename: Jian-Zhen
authors.initials: JZ
authors.lastname: Liao
authors.affiliation: Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science , Fuzhou, Fujian 350002, People's Republic of China.|University of Chinese Academy of Sciences , Beijing, 100049, China.
authors.forename: Jin-Yu
authors.initials: JY
authors.lastname: Hu
authors.affiliation: Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science , Fuzhou, Fujian 350002, People's Republic of China.|College of Materials Science and Engineering, Fujian Normal University , Fuzhou, Fujian 350007, People's Republic of China.
authors.forename: Ji-Hui
authors.initials: JH
authors.lastname: Jia
authors.affiliation: Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science , Fuzhou, Fujian 350002, People's Republic of China.
authors.forename: Can-Zhong
authors.initials: CZ
authors.lastname: Lu