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Enhanced electroluminescent efficiency from spin-coated europium(III) organic light-emitting device

Authors
Journal
Synthetic Metals
0379-6779
Publisher
Elsevier
Publication Date
Volume
126
Issue
1
Identifiers
DOI: 10.1016/s0379-6779(01)00373-3
Keywords
  • Oled
  • Organolanthanide Phosphor
  • Eu Complex

Abstract

Abstract Devices containing the europium complex Eu(TTFA) 3(phen) were fabricated by spin-coating. The complex was doped into poly(9-vinylcarbazole) (PVK) along with (4- tert-butylphenyl)biphenyloxadiazole (PBD) as electron-transporting material. Addition of an evaporated layer of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (bathocuproine, BCP) forming a two-layer device structure between indium-tin oxide (ITO) and Ca:Al electrodes gave enhanced brightness and efficiency. A device 3 wt.% Eu(TTFA) 3(phen):32 wt.% PBD:PVK with a BCP hole-blocking layer gave Eu emission with a maximum luminance of 417 cd m −2 at 25 V and 175 mA cm −2.

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