Doping-free hybrid white organic light-emitting diodes with fluorescent blue,phosphorescent green and red emission layers |
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| Affiliation: | 1. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China;2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Changchun 130022, PR China;1. Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany;2. Fraunhofer Institute for Photonic Microsystems, 01069 Dresden, Germany;1. Department of Advanced Materials Chemistry, Korea University, Sejong 30019, South Korea;2. Department of Chemistry, Seoul Women''s University, Seoul 01797, South Korea;1. Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China;2. School of Material Science and Engineering, Jiangsu Engineering Centre forFlat-Panel Displays & Solid-state Lighting, Nanjing University of Posts & Telecommunications, 9 Wzenyuan Road, Nanjing 210023, China;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. 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 |
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| Abstract: | Industrialized white organic light-emitting diodes (OLEDs) currently require host-guest doping, a complicated process necessitating precise control of the guest concentration to get high efficiency and stability. Two doping-free, hybrid white OLEDs with fluorescent blue, and phosphorescent green and red emissive layers (EMLs) are reported in this work. An ultra-thin red phosphorescent EML was situated in a blue-emitting electron transport layer (ETL), while the ultra-thin green phosphorescent EML was placed either in the ETL (Device 1), or the hole transport layer (HTL) (Device 2). Device 2 exhibits higher efficiency and more stable spectrum due to the enhanced utilization of excitons by ultra-thin green EML at the exciton generation zone within the HTL. Values of current efficiency (CE), power efficiency (PE), and CRI obtained for the optimized hybrid white OLEDs fabricated through a doping-free process were of 23.2 cd/A, 20.5 lm/W and 82 at 1000 cd/m2, respectively. |
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| Keywords: | Hybrid white OLEDs Doping-free Exciton generation zone |
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