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Exciton management by co-doping of blue triplet emitter as a lifetime improving method of blue thermally activated delayed fluorescent devices
Affiliation:1. School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 440-746, South Korea;2. Advanced Materials R&D, LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon, South Korea;1. Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea;2. Chemistry, Imperial College London, London, SW7 2AZ, United Kingdom;3. Department of Materials Engineering and Convergence Technology and ETI, Gyeongsang National University, Jinju, 660-701, Republic of Korea;4. Department of Polymer Science & Engineering and Department of IT Convergence, Korea National University of Transportation, 50 Daehak-Ro, Chungju, 27469, Republic of Korea;1. Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, PR China;2. Laboratory of Materials Science, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032, PR China;1. College of Communications and Electronics Engineering, Qiqihar University, Heilongjiang, 161006, China;2. Modern Education Technology Center, Qiqihar University, Heilongjiang, 161006, China;3. Department of Physics and Materials Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;4. Mudanjiang Medical College, Heilongjiang, 157011, China;1. School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China;2. Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, China;1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;2. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Abstract:
Co-doping of a blue phosphorescent emitter in a thermally activated delayed fluorescent (TADF) emitter based emitting layer was developed as an approach to extend the lifetime of blue TADF devices by managing excitons and polarons in the emitting layer. The blue phosphorescent emitter was doped at a very low doping concentration below 1 wt% to suppress triplet-triplet and triplet-polaron quenching effect in the TADF emitting layer. The doping of the blue phosphorescent emitter led to great extension of the lifetime of the TADF devices by hole trapping effect of the blue triplet emitter which widened exciton formation zone in the TADF emitting layer. More than twice extension of the operational lifetime of the device was demonstrated by the co-doping approach irrespective of the doping concentration of the TADF emitter in the emitting layer.
Keywords:Delayed fluorescence  Lifetime  Blue device  Exciton  Polaron
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