Spin injection into organic light-emitting diodes with a ferromagnetic cathode and observation of the luminescence properties

Eiji Shikoh, Toru Kawai, Akihiko Fujiwara, Yasuo Ando, Terunobu Miyazaki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Electroluminescence (EL) properties of organic light-emitting diodes (LEDs) under an external magnetic field were investigated for observation of spin-polarized luminescence. When an external magnetic field was applied to organic LEDs with an Fe cathode, circularly polarized light was observed, while devices with an Al cathode did not show such behavior. In order to confirm whether the circularly polarized light was certainly due to spin injection or not, photoluminescence (PL) property of Alq3 (tris-(8-hydroxyquinolinato)-aluminum) film on Fe and that of Alq3 film on Al under an external magnetic field were investigated. In the case of Alq3 on Fe film, the degree of circular polarization from EL was much higher than that from PL. This suggested that circular polarization on EL was mainly due to spin injection.

Original languageEnglish
Pages (from-to)2052-2054
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 3
DOIs
Publication statusPublished - 2007 Mar

Keywords

  • Electroluminescence
  • Magneto-optical effect
  • Organic light-emitting diode
  • Photoluminescence
  • Spin injection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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