Green Ir(III) complexes with multifunctional ancillary ligands for highly efficient solution-processed phosphorescence organic light-emitting diodes with high current efficiency |
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| Affiliation: | 1. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254, Kaunas, Lithuania;2. Department of Photonics Engineering, Yuan Ze University, Chung-Lim, 32003, Taiwan, ROC;1. Department of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center (ERC), Pusan National University, Busan 46241, Republic of Korea;2. Beamline Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673 Republic of Korea;3. Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science (KIMS), Gyeongnam 51508, Republic of Korea;1. Department of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Pusan National University, Busan, 609-735, Republic of Korea;2. Department of Fire Safety, College of Engineering, Kyungil University, Gyeongsan, Gyeongbuk, 38428, Republic of Korea;3. Advanced Functional Thin Films Department Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam, 642-831, Republic of Korea;1. Kaunas University of Technology, Department of Polymer Chemistry and Technology, Radvilenu pl. 19, LT-50254 Kaunas, Lithuania;2. Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India;3. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan |
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| Abstract: | Two new highly efficient green emitting heteroleptic Ir(III) complexes, namely, bis5-(2-ethylhexyl)-8-(trifluoromethyl)benzoc]1,5]naphthyridin-6(5H)-one]iridium-4-((3,5-di(9H-carbazol-9-yl)benzyl)oxy)picolinate (Ir-HT) and bis5-(2-ethylhexyl)-8-(trifluoromethyl) benzoc]1,5]naphthayridin-6(5H)-one]iridium-4-((4-(5-phenyl-1,3,4-oxadiazol-2-yl)benzyl) oxy)picolinate (Ir-ET) were designed and synthesized for solution-processed phosphorescence organic light-emitting diodes (PHOLEDs). These new Ir(III) complexes are based on amide-bridged trifluoromethyl (-CF3) substituted phenylpyridine unit as main ligand and 1,3-bis(N-carbazolyl)benzene (mCP) unit and 1,3,4-oxadiazole (OXD) unit functionalized picolinate (pic) as an ancillary ligand. These multifunctional groups were attached into the 4-position of pic ancillary ligands via ether linkage. Interestingly, the solution-processed PHOLED device using Ir-HT as a dopant exhibited a maximum external quantum efficiency (EQEmax) of 20.92% and a maximum current efficiency (CEmax) of 64.04 cd A?1. Whereas PHOLED device using Ir-ET displayed a EQEmax of 20.68% and a CEmax of 65.02 cd A?1. This is one of best CE with high EQE for green Ir(III) complexes via solution-processed PHOLEDs using multifunctional ancillary ligands so far. |
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| Keywords: | Green Ir(III) complexes Multifunctional ancillary ligands High current efficiency High color purity Organic light-emitting diodes |
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