Multifunctional red phosphorescent bis-cyclometallated iridium complexes based on 2-phenyl-1,2,3-benzotriazole ligand and carbazolyl moieties |
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Authors: | Tadas MalinauskasMaryte Daskeviciene Karolis Kazlauskas Hai-Ching SuJuozas Vidas Grazulevicius Saulius JursenasChung-Chih Wu Vytautas Getautis |
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Affiliation: | a Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu pl. 19, 50270 Kaunas, Lithuania b Institute of Applied Research, Vilnius University, Sauletekio 9 - III, 10222 Vilnius, Lithuania c Institute of Lighting and Energy Photonics, National Chiao Tung University, Tainan 71150, Taiwan d Department of Electrical Engineering, Graduate Institute of Photonics and Optoelectronics, and Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 106, Taiwan |
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Abstract: | Multifunctional phosphorescent bis-cyclometallated iridium(III) complexes based on the 2-phenyl-1,2,3-benzotriazole moiety and bearing branched hole-transporting carbazole fragments were synthesized. The isolated compounds were found to be amorphous and expressed very good solubility. Introduction of flexible aliphatic chains of various lengths into the iridium complexes enabled manipulation of their glass transition temperature. The iridium complexes exhibited red phosphorescence emission at 650 nm with the lifetime of 5.7 μs and phosphorescence quantum yields of 0.22 and 0.17 in solution and solid state, respectively, at room temperature. The shielding effect of the carbazolyl moieties on the concentration quenching of phosphorescence of the iridium centers was found to result in the increased excited state lifetime and quantum yield due to the suppressed exciton migration. Non-optimized OLED devices, based on the phosphorescent bis-cyclometallated iridium(III) complex without host material were fabricated and their electroluminescence properties were evaluated. |
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Keywords: | Carbazole Iridium complex Phosphorescence Triazole |
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