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High-efficient phosphorescent iridium(III) complexes with benzimidazole ligand for organic light-emitting diodes: Synthesis, electrochemistry and electroluminescent properties |
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| Authors: | Chunxiang Li Hung-Hsin Shih Peipei Sun Yi Pan |
| Institution: | a College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China b Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Environmental Science, Nanjing Normal University, 122, Ninghai Road, Nanjing, Jiangsu 210097, PR China c School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China d Department of Chemistry, Tsing Hua University, Hsinchu 300, Taiwan |
| Abstract: | Two phosphorescent complexes Ir(FFBI)2(pmp) and Ir(FFBI)2(pti) based on cyclometalated ligand 1-(4-fluorobenzyl)-2-(4-fluorophenyl)-1H-benzod]imidazole (FFBI) and ancillary ligands 2-(phenyliminomethyl)phenol (pmp) or 3-(pyridin-2-yl)-4,5,6,7-tetrahydro-2H-indazole (pti) were synthesized. The single crystal of Ir(FFBI)2(pmp) was obtained. The light emitting and electrochemical properties of these complexes were studied. The electroluminescent devices based on these two complexes with the structure of ITO/NPB (40 nm)/Ir complex: CBP (30 nm)/BCP (15 nm)/Alq (30 nm)/LiF (1 nm)/Al (100 nm) emitted cyan color, with high brightness and efficiencies. The maximum external quantum efficiencies reached to 6.8% and 11.6%, respectively. |
| Keywords: | Electrophosphorescence Ir-complex Synthesis OLEDs |
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