An organic light emitting device employing transparent rutile TiO 2 as an anode

Masaki Nakano, Tomoteru Fukumura, Hidemi Toyosaki, Kazunori Ueno, Masashi Kawasaki

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Organic light emitting devices (OLEDs) using a transparent semiconductor rutile TÍO2 film on r-sapphire substrate as an anode shows fine surface emission. The OLED structure is TiO2/poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS)/N,N′-Di-[(1-naphthalenyl)-N,N′- diphenyl]-(l,l'-biphenyl)-4,4'-diamine (α-NPD)/tris(8-hydroxyquinoline) aluminum (Alq3)/LiF/Al. The obtained maximum luminance and current efficiency are 1340 cd/m2 at 21.0 V and 1.6 cd/A at 15.0 V, respectively. Current efficiency and turn-on voltage of the OLEDs systematically depend on the resistivity of the TiO2 anode. This trend can be explained by dependence of hole injection efficiency on the resistivity.

Original languageEnglish
Pages (from-to)L1061-L1063
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number37-41
Publication statusPublished - 2006 Oct 1


  • Alq
  • Anode
  • Hole injection
  • Organic light emitting device
  • Oxide semiconductor
  • TiO

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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