Sputter deposition of cathodes in organic light emitting diodes

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)4607-4612
Journal / PublicationJournal of Applied Physics
Volume86
Issue number8
Publication statusPublished - 15 Oct 1999

Abstract

Sputter deposition was employed for cathode preparation in organic light emitting diodes (OLEDs). A thin film of copper phthalocyanine (CuPc) was found to be an effective buffer layer in preventing sputter damage to the OLED layer structure. However, the CuPc layer forms an electron-injection barrier with the underlying Alq layer, resulting in increased electron-hole recombination in the nonemissive CuPc layer, and thus a substantial reduction in electroluminescence efficiency. Incorporation of Li at the CuPc/Alq interface from a sputter-deposited Al (Li) cathode was found to reduce the injection barrier at the interface and make the overall device efficiency comparable to a device having an evaporated MgAg cathode. The devices exhibited good operational stability with a half lifetime greater than 3800 h at 20 mA/cm2. © 1999 American Institute of Physics.

Citation Format(s)

Sputter deposition of cathodes in organic light emitting diodes. / Hung, L. S.; Liao, L. S.; Lee, C. S. et al.
In: Journal of Applied Physics, Vol. 86, No. 8, 15.10.1999, p. 4607-4612.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review