Doping-free orange and white phosphorescent organic light-emitting diodes with ultra-simply structure and excellent color stability |
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| Affiliation: | 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China;2. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;3. University of Chinese Academy of Sciences, Beijing 100039, PR China;1. Department of Physics and Astronomy, London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, UK;2. Istituto per la Sintesi Organica e la Fotoreattività, Centro Nazionale delle Ricerche (CNR), via P. Gobetti 101, Bologna 40129, Italy;3. BASF SE, Carbon Materials Innovation Center, Ludwigshafen 67056, Germany;1. School of Chemical Engineering and Material Science, Chung-Ang University, Seoul 156-756, South Korea;2. Energy Nano Materials Research Center, Korea Electronics Technology Institute (KETI), Seongnam 463-816, South Korea;1. Department of Clinical Pharmacy, School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei, Taiwan;2. Department of Green Material Technology, Green Technology Research Institute, Chinese Petroleum Corporation (CPC Corporation), Kaohsiung, Taiwan;3. Department of Mechanical and Automation Engineering, I-Shou University, Kaohsiung, Taiwan;4. Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, Kaohsiung, Taiwan;1. School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410004, People’s Republic of China;2. Physics Science and Engineering Technology College, Yichun University, Yichun 336000, People’s Republic of China;3. Department of Applied Physics, Hunan University and Key Lab for Micro-Nano Physics and Technology of Hunan Province, Changsha 410082, People’s Republic of China |
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| Abstract: | We demonstrate simplified doping-free orange phosphorescent organic light-emitting diodes (OLEDs) based on ultrathin emission layer. The optimized orange device has the maximum current efficiency of 52.1 cd/A and power efficiency of 36.3 lm/W, respectively. Efficient simplified doping-free white OLEDs employing blue and orange ultrathin emission layers have excellent color stability, which is attributed to the avoidance of the movement of charges recombination zone and no differential color aging. One white device exhibits high efficiency of 33.6 cd/A (30.1 lm/W). Moreover, the emission mechanism of doping-free orange and white OLEDs is also discussed. |
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| Keywords: | Organic light-emitting diodes Phosphorescent Doping-free Simplified Superior stable spectra |
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