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High efficiency phosphorescent white organic light-emitting diodes with an ultra-thin red and green co-doped layer and dual blue emitting layers
Affiliation:1. Department of Materials Science, University of Rochester, Rochester, NY 14627, USA;2. Department of Chemical Engineering, University of Rochester, Rochester, NY 14627, USA;3. Department of Chemistry, University of Rochester, Rochester, NY 14627, USA;1. Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Sichuan University, Chengdu 610064, PR China;2. Department of Organic Device Engineering, Research Center for Organic Electronics, Yamagata University, Yonezawa 992-8510, Japan;1. Department of Chemistry Education, Graduate Department of Chemical Materials, and Institute for Plastic Information and Energy Materials, Pusan National University, Busan 609-735, Republic of Korea;2. Polymer Chemistry Laboratory, College of Engineering, Kyungil University, Gyeongsan 712-701, Republic of Korea;3. Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea;1. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;2. Shanxi Research Center of Advanced Materials Science and Technology, Taiyuan 030024, China;3. Key Laboratory for Organic Electronics & Information Displays, Institute of Advanced Materials, Nanjing University of Posts & Telecommunications, Nanjing 210023, China;4. Department of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China;5. Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Hong Kong, China;1. Key Laboratory for Organic Electronics & Information Displays (KLOEID), Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications (NUPT), Nanjing 210023, China;2. Jiangsu-Singapore Joint Research Center for Organic/Bio-Electronics & Information Displays and Institute of Advanced Materials, Nanjing Tech University, Nanjing 211816, China;1. Engineering Laboratory of Polylactic Acid-Based Functional Materials of Yunnan, School of Chemistry and Biotechnology, Yunnan Minzu University, Kunming 650500, China;2. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
Abstract:Phosphorescent white organic light emitting diodes (WOLEDs) with a multi-layer emissive structure comprising two separate blue layers and an ultra-thin red and green co-doped layer sandwiched in between have been studied. With proper host and dopant compositions and optimized layer thicknesses, high-performance WOLEDs having a power efficiency over 40 lm/W at 1000 cd/m2 with a low efficiency roll-off have been produced. Through a systematic investigation of the exciton confinement and various pathways for energy transfer among the hosts and dopants, we have found that both the ultra-thin co-doped layer and two blue emitting layers play a vital role in achieving high device efficiency and controllable white emission.
Keywords:Organic light-emitting diodes  White OLED  Ultra-thin layer  High performance  Exciton energy transfer  Lifetime
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