Synthesis,characterization of the phenylquinoline-based on iridium(III) complexes for solution processable phosphorescent organic light-emitting diodes |
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Authors: | Juhyeon Park Jin Su Park Young Geun Park Jin Yong Lee Jae Wook Kang Jun Liu Liming Dai Sung-Ho Jin |
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Affiliation: | 1. Department of Chemistry Education, Graduate Department of Materials Chemistry, Institute for Plastic Information and Energy Materials, Pusan National University, Busan 609-735, Republic of Korea;2. Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Republic of Korea;3. Department of Flexible and Printable Electronics, Chonbuk National University, Jeonju 561-756, Republic of Korea;4. Department of Macromolecular Science and Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, United States |
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Abstract: | A new series of highly efficient Ir(III) complexes, (DPQ)2Ir(pic-N-O), (F4PPQ)2Ir(pic-N-O), (FPQ)2Ir(pic-N-O), and (CPQ)2Ir(pic-N-O) were synthesized for phosphorescent organic light-emitting diodes (PhOLEDs), and their photophysical, electrochemical, and electroluminescent (EL) properties were investigated. The Ir(III) complexes, including picolinic acid N-oxide (pic-N-O) ancillary ligand, are comprised with the various main ligands such as 2,4-diphenylquinoline (DPQ), 4-phenyl-2-(2,3,4,5-tetrafluorophenyl)quinoline (F4PPQ), 2-(9,9-diethyl-9H-fluoren-2-yl)-4-phenylquinoline (FPQ) and 9-ethyl-3-(4-phenylquinolin-2-yl)-9H-carbazole. Remarkably, high performance PhOLEDs using a solution-processable (DPQ)2Ir(pic-N-O) doped CBP host emission layer were fabricated to give a high luminance efficiency (LE) of 26.9 cd/A, equivalent to an external quantum efficiency (EQE) of 14.2%.The calculated HOMO–LUMO energy gaps for (DPQ)2Ir(pic-N-O), (F4PPQ)2Ir(pic-N-O), (FPQ)2Ir(pic-N-O) and (CPQ)2Ir(pic-N-O) were in good agreement with the experimental results. |
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Keywords: | Organic light-emitting diodes Iridium complex Phosphorescent Solution processable Picolinic acid N-oxide |
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