Tris-(8-hydroxyquinoline)aluminum-modified indium tin oxide for enhancing the efficiency and reliability of organic light-emitting devices

Yoon Fei Liew, Furong Zhu*, Soo Jin Chua, Jian Xin Tang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Tris-(8-hydroxyquinoline)aluminum (Alq 3), which is typically used as an electron transport material for organic light-emitting devices (OLEDs), was used in this study for OLED anode modification. The electronic structure at the indium tin oxide (ITO)/organic interface for improvement of carrier injection was studied using ultraviolet photoelectron spectroscopy. The interfacial analysis reveals that the barrier height at the ITO/organic interface can be varied from ∼ 0.6-1.08 eV. It is demonstrated that the barrier for hole injection from an ITO anode to a hole transporting layer can be engineered by inserting an ultrathin interlayer of Alq 3, a few nanometers thick. The presence of an Alq 3 interlayer is shown to improve the current balance, leading to an enhancement in the electroluminecent efficiency and operational stability of OLEDs.

Original languageEnglish
Pages (from-to)4511-4513
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number19
DOIs
Publication statusPublished - 8 Nov 2004

Scopus Subject Areas

  • Physics and Astronomy (miscellaneous)

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