Pyridoindole modified carbazole compounds as high triplet energy host materials of imidazole derived blue triplet emitters for high quantum efficiency |
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| Affiliation: | 1. Department of Chemical Engineering, University of Rochester, Rochester, NY 14627, USA;2. Department of Chemistry, University of Rochester, Rochester, NY 14627, USA;1. Tianjin University, School of Chemical Engineering and Technology, Tianjin, 300072, China;2. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China;1. Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul, 130-701, Republic of Korea;2. Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan, Chonbuk, 570-749, Republic of Korea;3. Division of Microelectronics and Display Technology, Wonkwang University, Iksan, 570-749, Republic of Korea;4. Solar Cell Research Institute, Next Generation Industrial Radiation Technology RIC, Wonkwang University, Iksan, 570-749, Republic of Korea;1. Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University, Chungnam 330-714, Republic of Korea;2. Department of Polymer Science and Engineering, Dankook University 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi 448-701, Republic of Korea |
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| Abstract: | Carbazole compounds modified with a pyridoindole moiety were examined as thermally stable high triplet energy host materials for tris1-(2,4-diisopropyldibenzob,d]furan-3-yl)-2-phenylimidazole] (Ir(dbi)3) based blue phosphorescent organic light-emitting diodes. A well-known carbazole compound, N,N′-dicarbazolyl-3,5-benzene, was substituted with one or two pyridoindole moieties to develop the thermally stable host materials for Ir(dbi)3 blue triplet emitters. Remarkably high glass transition temperature of 196 °C and thermal decomposition temperature of 486 °C in addition to high triplet energy of 2.89 eV were achieved by the pyridoindole modification. The pyridoindole modified carbazole compounds also delivered high quantum efficiency of 25.4% in the blue phosphorescent devices by doping Ir(dbi)3. |
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| Keywords: | Carbazole Pyridoindole modification Blue device Thermal stability High efficiency |
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