Design strategy of yellow thermally activated delayed fluorescent dendrimers and their highly efficient non-doped solution-processed OLEDs with low driving voltage |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 210096, PR China;2. Department of Chemical and Pharmaceutical Engineering of Southeast University Chengxian College, Nanjing, Jiangsu, 210088, PR China;1. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People''s Republic of China;2. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People''s Republic of China;1. School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, PR China;2. Functional Nano and Soft Materials Laboratory (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu, 215123, PR China;3. Nano-organic Photoelectronic Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China;1. Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan, 030024, China;2. Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan, 030024, China;3. Co-innovation Center for Micro/Nano Optoelectronic Materials and Devices, Research Institute for New Materials Technology, Chongqing University of Arts and Science, Chongqing, 402160, China;1. School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China;2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;3. College of Mechanical and Electrical Engineering, Yangtze Normal University, Chongqing 408100, PR China |
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| Abstract: | We designed and synthesized two dendrimers TA-Cz and TA-3Cz with TADF characteristics by using non-conjugated aliphatic chains carbazole/tricarbazole as peripheral dendrons. Both dendrimers possess excellent thermal and morphological stabilities. Introduced the phenyl bridge to increase the distance of the emission core TA between donor (D) and acceptor (A) is a promising route to simultaneously achieve small singlet–triplet energy splitting (ΔEST) and enhanced PL quantum yields (PLQYs). Furthermore, non-conjugated aliphatic chains carbazole/tricarbazole dendrons were conveniently introduced to the TADF core, which can effective encapsulate the emission core to restrain the concentration quenching effect and make the fluorescence of the core independent. By utilizing TA-3Cz emitter as the non-doped solution-processed emissive layers, the resulting yellow OLED achieved low driving voltage of 2.4 V and superior external quantum efficiency of 11.8%. Thus, our results here provide a facile strategy to obtain highly efficient non-doped solution-processed OLEDs by employing the reasonable molecular design of the TADF core and the utilization of flexible alkyl chain. |
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| Keywords: | Dendrimers TADF Non-doped Solution-processed PLQYs Δ |
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