標題: Multifunctional red phosphorescent bis-cyclometallated iridium complexes based on 2-phenyl-1,2,3-benzotriazole ligand and carbazolyl moieties
作者: Malinauskas, Tadas
Daskeviciene, Maryte
Kazlauskas, Karolis
Su, Hai-Ching
Grazulevicius, Juozas Vidas
Jursenas, Saulius
Wu, Chung-Chih
Getautis, Vytautas
照明與能源光電研究所
Institute of Lighting and Energy Photonics
關鍵字: Carbazole;Iridium complex;Phosphorescence;Triazole
公開日期: 11-Mar-2011
摘要: 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 mu s 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. (C) 2011 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.tet.2011.01.026
http://hdl.handle.net/11536/9151
ISSN: 0040-4020
DOI: 10.1016/j.tet.2011.01.026
期刊: TETRAHEDRON
Volume: 67
Issue: 10
起始頁: 1852
結束頁: 1861
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