Organic electrophosphorescent devices with mixed hole transport material as emission layer

Hidenobu Matsushima, Shigeki Naka*, Hiroyuki Okada, Hiroyoshi Onnagawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

We report on the reduction of driving voltage in organic electrophosphorescent devices with mixed hole transport material as emission layer. The emission layer was mixed with N, N′-diphenyl-N,N′-(3-methylphenyl)-[1,1′-biphenyl]-4, 4′-diamine (TPD) as a hole-transport material, 4,4′-bis(9-carbazolyl)-biphenyl (CBP) as a host material for a phosphorescent material, tris(2-phenylpyridine) iridium (Ir(ppy)3) as a phosphorescent material and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (bathocuproine: BCP) as an electron-transport material. The emission occurred from Ir(ppy)3 and was independent on the ratio of TPD and CBP. For triple-layered device with the TPD:CBP mixing ratio of 10:90, maximum luminance obtained was 104,000 cd/m2 at V=12 V, J=490 mA/cm2. Maximum efficiency was 20 lm/W at 3.1 mA/cm2.

Original languageEnglish
Pages (from-to)305-308
Number of pages4
JournalCurrent Applied Physics
Volume5
Issue number4
DOIs
StatePublished - 2005/05

Keywords

  • Carrier mobility
  • Organic electrophosphorescent device
  • Time-of-flight

ASJC Scopus subject areas

  • General Materials Science
  • General Physics and Astronomy

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