Thermally stable efficient hole transporting materials based on carbazole and triphenylamine core for red phosphorescent OLEDs |
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| Affiliation: | 1. Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan City, Chonbuk, 570-749, Republic of Korea;2. Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul, 130-701, Republic of Korea;1. Department of Energy Science & Engineering, DGIST, 333, Techno Jungang Daero, Hyeonpung-Myeon, Dalseong-Gun, Daegu, 42988, Republic of Korea;2. School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-Gu, Suwon-Si, Gyeonggi-Do, 16419, Republic of Korea;1. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu plentas 19, LT50254, Kaunas, Lithuania;2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China;3. Department of Electrical Power Systems, Kaunas University of Technology, Studentu g. 50, Kaunas, LT51368, Lithuania;1. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan;2. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254, Kaunas, Lithuania;3. Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector-81, Knowledge City, Manauli-140306, India;4. Department of Biochemistry, Faculty of Natural Sciences, Vytautas Magnus University, Vileikos str. 8, 44404 Kaunas, Lithuania;5. Center for Nanotechnology, National Tsing Hua University, Hsinchu 30013, Taiwan;6. Department of Biochemistry, Faculty of Medicine, Lithuanian University of Health Sciences, Tilzes str. 18, 47181 Kaunas, Lithuania;1. Department of Materials Science and Engineering, National Tsing-Hua University, Hsin-Chu 30013, Taiwan, ROC;2. Center for Nanotechnology, Materials Science, and Microsystems, National Tsing-Hua University, Hsin-Chu 30013, Taiwan, ROC;3. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu plentas 19, LT50254 Kaunas, Lithuania;4. Electronics and Optoelectronics Lab, Industrial Technology Research Institute, Hsin-Chu 31040, Taiwan, ROC;1. Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai, 200237, PR China;2. Higher Education Key Laboratory of New Microstructure Functional Materials in Shanxi Province, Shanxi Datong University, Datong, 037009, PR China;3. MOE Key Laboratory for Interface Science and Engineering in Advanced Materials and Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, 79 Yingze West Street, Taiyuan, 030024, PR China;4. Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Hong Kong, China |
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| Abstract: | In this work, a series of hole transporting materials with carbazole and triphenylamine cores have been synthesized and characterized. In the carbazole's 3rd and 6th positions, two site tryphenylamine para positions are end capped with the same types of branching derivatives to compare the overall performances of constructed devices. All of our hole transporting materials showed good thermal stabilities without any crystallized features which expressed in higher decomposition temperature (Over 500 °C at 5% weight reduction). All synthesized materials revealed HOMO energy levels between −5.62 and −5.48 eV, which values are lying between HOMO energy values of anode and emission layer; as a result, it made an effective path for hole transportation. Higher lying LUMO values between −2.51 and −2.31 can block the electrons from adjacent layer to ensure the perfect recombination in the middle layer. Triphenylamine based HTMs indicated better performances than carbazole based HTMs. Further comparisons were done by using NPB as hole transporting material with the same red phosphorescent based OLED device. HTM2A based device IV was exhibited higher maximum current efficiency of 30.6 cd/A and higher maximum external quantum efficiency of 26.7% than reference NPB based device. Measured Hole mobility value of HTM2A with hole dominant device was 5.3 × 10−4 cm2 V−1 s−1, which was better than NPB. Synthesized HTM2A would be a promising hole transporting material for various phosphorescent based OLEDs. |
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| Keywords: | Organic light emitting diodes Hole transporting materials Red phosphorescent Carbazole Triphenylamine |
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