Efficient,color-stable and high color-rendering-index white organic light-emitting diodes employing full thermally activated delayed fluorescence system |
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| Affiliation: | 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), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, PR China;1. School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 440-746, Republic of Korea;2. Advanced Materials R&D, LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon, Republic of Korea;1. Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan, 030024, China;2. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, 030024, China;3. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China;1. School of Optoelectronic Science and Engineering, 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;1. Key Laboratory of Interface Science and Engineering in Advanced Materials of Taiyuan University of Technology, Ministry of Education, No. 79, West Yingze Street, Taiyuan Shanxi 030024, China;2. College of Materials Science and Engineering, Taiyuan University of Technology, 79, West Yingze Street, Taiyuan Shanxi 030024, China;3. Shanxi Research Center of Advanced Materials Science and Technology, Taiyuan 030024, China;4. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, China;5. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | High efficiency, high color rendering index (CRI) and excellent color-stability are important requirements for high-performance white organic light emitting diodes (WOLEDs). To realize these issues for the WOLEDs based on the full thermally activated delayed fluorescence (TADF) system, we constructed WOLED devices by employing CDBP:PO-T2T exciplex as the host, while 2CzPN and AnbTPA as blue and red dopants, respectively. We carefully optimize the device to realize balanced carrier transporting property of each emitting layer and good exciton confinement in the device. As a result, the WOLED achieves stable white emission with a high CRI of 82, a CIE coordinate of (0.33, 0.38) at a luminance of 1000 cd m−2, and a small CIE variation value of (0.00, 0.02) in the luminance range of 100–3000 cd m−2. It also demonstrates high maximum forward-viewing external quantum efficiency of 19.2%, current efficiency of 36.7 cd A−1 and power efficiency of 46.2 lm W−1. Our work presents a novel and useful approach to develop highly efficient, color-stable and high-CRI WOLEDs through the full TADF mechanism. |
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| Keywords: | Thermally activated delayed fluorescence WOLED Exciplex host Triplet harvest Color-stable |
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