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Highly Efficient Au(I) Alkynyl Emitters: Thermally Activated Delayed Fluorescence and Solution-Processed OLEDs |
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| Authors: | Fei-Hu Yu Xiu-Fang Song Guan-Hao Liu Dr Xiaoyong Chang Dr Kai Li Prof Dr Ying Wang Prof Dr Ganglong Cui Prof Dr Yong Chen |
| Institution: | 1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 100190 Beijing, P. R. China
University of Chinese Academy of Sciences, 100049 Beijing, P. R. China These authors contribute equally to this work.;2. Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, Chemistry College, Beijing Normal University, 100875 Beijing, P. R. China These authors contribute equally to this work.;3. Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 100190 Beijing, P. R. China University of Chinese Academy of Sciences, 100049 Beijing, P. R. China;4. Department of Chemistry, Southern University of Science and Technology, 518055 Shenzhen, P. R. China;5. College of Materials Science and Engineering, Shenzhen University, 518055 Shenzhen, P. R. China;6. Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, Chemistry College, Beijing Normal University, 100875 Beijing, P. R. China;7. Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 100190 Beijing, P. R. China |
| Abstract: | Two-coordinate donor-metal-acceptor type coinage metal complexes displaying efficient thermally activated delayed fluorescence (TADF) have been unveiled to be highly appealing candidates as emitters for organic light-emitting diodes (OLEDs). Herein a series of green to yellow TADF gold(I) complexes with alkynyl ligands has been developed for the first time. The complexes exhibit high photoluminescence quantum yields (PLQYs) of up to 0.76 in doped films (5 wt % in PMMA) at room temperature. The modifications of alkynyl ligands with electron-donating amino groups together with the use of electron-deficient carbene ligands induce ligand-to-ligand charge transfer excited states that give rise to TADF emission. Spectroscopic and density functional theory (DFT) calculations reveal the roles of electron-donating capability of the alkynyl ligand in tuning the excited-state properties. Solution-processed organic light-emitting diodes (OLEDs) using the present complexes as emitters achieve maximum external quantum efficiency (EQE) of up to 20 %. |
| Keywords: | gold alkynyl complex high emission efficiency high EQEs metal TADF solution-processed OLEDs |