A terbium (III) complex with triphenylamine-functionalized ligand for organic electroluminescent device

Document Type

Article

Publication Date

4-1-2008

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. © 2007 Elsevier B.V. All rights reserved.

Publication Source (Journal or Book title)

Journal of Luminescence

First Page

620

Last Page

624

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