Interface studies of Aluminum, 8-hydroxyquinolatolithium (Liq) and Alq3 for inverted OLED application

Youjong Lee, Joohyung Kim, Soonnam Kwon, Chang Ki Min, Y. Yi, J. W. Kim, Bonki Koo, Mun Pyo Hong

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Abstract

This study examined the interfaces of Alq3 on a thin 8-hydroxyquinolatolithium (Liq) layer deposited on aluminum using X-ray and ultraviolet photoemission spectroscopy. A thin layer of Liq reacted with the underlying aluminum surface. As a result, the molecular orbital features of Alq3 shifted to a higher binding energy and a new gap state was created. This effect is believed to lower the barrier height for electron injection. An organic light emitting device with a structure of ITO/Al/Liq/Alq3/NPB/WO3/Al was fabricated.The device performance showed characteristics that were consistent with the results of the photoemission studies. It is proposed that Al/Liq can be used as an efficient electron injection layer for inverted organic light emitting devices.

Original languageEnglish
Pages (from-to)407-412
Number of pages6
JournalOrganic Electronics
Volume9
Issue number3
DOIs
Publication statusPublished - 2008 Jun

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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