Bright red electroluminescent devices using novel second-ligand-contained europium complexes as emitting layers

Ling Huang; Ke-Zhi Wang; Chun-Hui Huang; Fu-You Li; Yan-Yi Huang

doi:10.1039/B006919L

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Ling Huang,^a Ke-Zhi Wang,^ab Chun-Hui Huang,*^a Fu-You Li^a and Yan-Yi Huang^a

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* Corresponding authors

^a State Key Laboratory of Rare Earth Materials Chemistry and Applications and the University of Hong Kong Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing, P. R. China
E-mail: hch@chemms.chem.pku.edu.cn

^b Department of Chemistry, Beijing Normal University, Beijing, P. R. China

Abstract

With two novel second ligands, 2-(2-pyridyl)benzimidazole (HPBM) and 1-ethyl-2-(2-pyridyl)benzimidazole (EPBM), two europium complexes, Eu(DBM)₃HPBM and Eu(DBM)₃EPBM (DBM = dibenzoylmethanato), were prepared and used as emitting materials in organic electroluminescent (EL) devices. The devices with the structures ITO/TPD/Eu(DBM)₃HPBM (or Eu(DBM)₃EPBM)/Al and ITO/TPD/Eu(DBM)₃EPBM/AlQ/Al emit red light originating from the europium complexes. The EL luminance of Eu(DBM)₃EPBM is much higher than that of Eu(DBM)₃HPBM. A maximum luminance of 180 cd m⁻² in the triple layered device of Eu(DBM)₃EPBM was achieved at 18 V.

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Article information

DOI: https://doi.org/10.1039/B006919L
Article type: Paper
Submitted: 24 Aug 2000
Accepted: 16 Nov 2000
First published: 19 Jan 2001

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J. Mater. Chem., 2001,11, 790-793

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