Highly stable and high power efficiency tandem organic light-emitting diodes with transition metal oxide-based charge generation layers |
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| Affiliation: | 1. Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. Department of Electrical and Electronics Engineering, Department of Physics, and UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey;1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, People’s Republic of China;2. College of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People’s Republic of China;1. Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile;2. Department of Chemical Engineering, University of Rochester, Rochester, NY 14627, USA;3. Department of Chemistry, D''Youville College, Buffalo, NY 14201, USA;4. Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, HK, China;1. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics, and Physics, Chinese Academy of Sciences, Changchun 130033, People’s Republic of China;2. University of Chinese Academy of Sciences, Beijing 100039, People’s Republic of China;1. State Key Laboratory on Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China;2. Department of Mechanical and Electronic Engineering, Liaoning Provincial College of Communications, 102 Shenbei Road, Shenbei New District, Shenyang 110122, People’s Republic of China |
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| Abstract: | Tandem organic light-emitting diodes (OLEDs) have been studied to improve the long-term stability of OLEDs for 10 years. The key element in a tandem OLEDs is the charge generation layer (CGL), which provides electrons and holes to the adjacent sub-OLED units. Among different types of CGLs, n-doped electron transporting layer (ETL)/transition metal oxide (TMO)/hole transporting layer (HTL) has been intensively studied. Past studies indicate that this kind of CGL can achieve the desired efficiency enhancement, however, its long-term stability was reported not good and sometime even poor than a single OLED. This issue was not well addressed over the past 10 years. Here, for the first time, we found that this is caused by the unwanted diffusion of TMO into the underlying n-doped ETL layer and can be well resolved by introducing an additional diffusion suppressing layer (DSL) between them. Our finding will fully release the potential of TMO-based CGL in tandem OLEDs. |
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| Keywords: | Tandem OLED Charge generation layer Stability Power efficiency improvement Transition metal oxide |
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