Phenylimidazole-based homoleptic iridium(III) compounds for blue phosphorescent organic light-emitting diodes with high efficiency and long lifetime |
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| Affiliation: | 1. Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute (ETRI), 161 Gajeong-dong, Yuseong-gu, Daejeon 305-350, Republic of Korea;2. Duksan Neolux Co., Ltd., 21-32, Ssukgol-gil, Ipjang-myeon, Seobuk-gu, Cheonan-si, Chungcheongnam-do 331-821, Republic of Korea;3. School of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746, Republic of Korea;4. Division of Science Education, Kangwon National University, Chuncheon 200-701, Republic of Korea;1. Department of Chemistry, Federal University of São Paulo (UNIFESP), Diadema, SP, Brazil;2. Departamento de Física and CICECO, Aveiro Institute of Materials, Universidade de Aveiro, 3810-193, Aveiro, Portugal;1. School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, 518055, PR China;2. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore;3. Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, PR China;1. Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, India;2. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan |
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| Abstract: | In order to obtain triplet emitters with high stability and efficiency, three homoleptic iridium(III) compounds — specifically, Ir(tpim)3 (1), Ir(mtpim)3 (2), and Ir(itpim)3 (3), where tpim = 1-(1,1′:3′,1″-terphenyl]-2′-yl)-2-(4-fluorophenyl)-1H-imidazole, mtpim = 2-(4-fluorophenyl)-1-(5′-methyl-1,1′:3′,1″-terphenyl]-2′-yl)-1H-imidazole, and itpim = 2-(4-fluorophenyl)-1-(5′-isopropyl-1,1′:3′,1″-terphenyl]-2′-yl)-1H-imidazole — were prepared by one-pot reaction of the corresponding phenylimidazole ligand with an Ir(I) complex as a starting material. Compounds 1–3 emit bright sky-blue phosphorescence with λmax = 459–463 nm and phosphorescent quantum efficiencies of 0.38–0.50. Multi-layer phosphorescent organic light-emitting diodes using compounds 1–3 as the triplet emitters and mCBP (3,3-di(9H-carbazol-9-yl)biphenyl) as the host have been fabricated. Compound 3 doped in the emissive layer demonstrate external quantum efficiency as high as 20.1% at 1000 cd/m2. In addition, the device based on compound 1 as an emitter shows a stable lifetime greater than 300 h at 1000 cd/m2, which is one of the best results concerning the device lifetime. |
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| Keywords: | Blue phosphorescence Dopants Organic light-emitting diodes (OLEDs) Life-time |
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