Improved performance of the single-layer and double-layer organic light emitting diodes by nickel oxide coated indium tin oxide anode

I. Min Chan, Franklin Chau-Nan Hong

Research output: Contribution to journalArticlepeer-review

111 Citations (Scopus)

Abstract

The electrical and optical properties of the NiO films deposited under various conditions were first characterized. An ultra-thin layer of nickel oxide (NiO) was then deposited on the indium-tin oxide (ITO) anode to enhance the hole injection in the organic light-emitting diode (OLED) devices. A very low turn-on voltage (3 V) was actually observed for the device with the ITO/NiO anode in the conventional double layer heterojunction OLEDs. The enhancement of hole injection by the ITO/NiO anode was further verified by the hole-only device and by the device with a patterned NiO layer on the ITO anode. The luminance and the current density of the single-layer OLED device were also significantly improved by using the ITO/NiO anode to enhance the hole injection. Although the luminescence efficiency was low, the reasons of low efficiency were studied and the improvement method was proposed. Our results suggest that the NiO/ITO anode is an excellent choice to enhance the hole injection in OLED devices.

Original languageEnglish
Pages (from-to)304-311
Number of pages8
JournalThin Solid Films
Volume450
Issue number2
DOIs
Publication statusPublished - 2004 Mar 1

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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