A terbium (III) complex with triphenylamine-functionalized ligand for organic electroluminescent device |
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Authors: | Liming Zhang Bin Li Shumei Yue Ziruo Hong |
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Affiliation: | a Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China b Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100039, PR China |
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Abstract: | A novel ligand, 4-diphenylamino-benzoic acid (HDPAB), and the corresponding Tb (III) complex, Tb (DPAB)3 which can be dissolved easily in organic solvents were synthesized and characterized. Organic electroluminescent (EL) device with a structure of indium tin oxide (ITO)/poly(N-vinylcarbazole) (PVK): Tb (DPAB)3 (50 wt%, 80 nm)/1,3,5-tris-(N-phenylbenzimidazol-2-yl)benzene (TPBI) (30 nm)/tri(8-hydroxyquinoline)aluminum (AlQ) (20 nm)/LiF (1 nm)/Al (150 nm) in which Tb (DPAB)3 acted as an emitter were fabricated. The maximum luminance of 230 cd m−2 at 20 V and the maximum efficiency of 0.62 cd A−1 were obtained due to the introduction of hole-transporting group, representing the best result to date among Tb (III) carboxylate complexes based EL devices. These results indicate that modifications of rare earth complexes are a promising way to improve the properties of EL devices. |
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Keywords: | Electroluminescence Terbium complex Triphenylamine-functionalized |
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