Highly efficient green and red OLEDs based on a new exciplex system with simple structures |
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| Affiliation: | 1. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China;3. Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Sciences, City University of Hong Kong, Hong Kong SAR, PR China;1. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China;3. Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Sciences, City University of Hong Kong, Hong Kong Special Administrative Region;1. State Key Laboratory of Luminescence and Application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, PR China;2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, PR China;1. State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China;2. Shenzhen China Star Optoelectronics Technology Co., Ltd., Shenzhen 518132, China |
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| Abstract: | To further simplify the devices based on the exciplex host, an electron-donor 4-2-(9,9′-dimethylfluorene)]-triphenylamine (TPAF) with suitable highest occupied molecular orbital was used. Combined with an electron-acceptor 4,6-bis(3,5-di(pyridin-3-yl)phenyl)-2-methylpyrimidine (B3PYMPM) with appropriate lowest unoccupied molecular orbital, TPAF:B3PYMPM exhibits bluish-green exciplex emission and realizes ambipolar transporting property with a weight mixing ratio of 3:7. Owing to the appropriate characteristics of TPAF and B3PYMPM, OLEDs based on TPAF:B3PYMPM host were constructed with extremely simple device structures. All devices exhibit low turn-on voltages below 2.5 V and high maximum external quantum efficiencies of 20.1%, 19.2% and 5.4% for Ir(ppy)2acac-, Ir(MDQ)2acac-, and DCJTB-based devices. The results show that the feasibility of the TPAF:B3PYMPM exciplex system as the host in OLEDs, which possess both high performance and simplified device structure. |
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| Keywords: | OLEDs Exciplex Ambipolar host |
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