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Journal of Photonics for Energy • Open Access

Transparent oxide/metal/oxide trilayer electrode for use in top-emitting organic light-emitting diodes
Author(s): Edward Wrzesniewski; Sang-Hyun Eom; William T. Hammond; Weiran Cao; Jiangeng Xue

Paper Abstract

The most commonly used transparent electrode, indium-tin oxide (ITO), is costly and requires methods of deposition that are highly destructive to organic materials when it is deposited on top of the organic layers in top-emitting organic light-emitting devices (OLEDs). Here we have employed a trilayer electrode structure consisting of a thin layer of metal sandwiched between two MoO3 layers, which can be deposited through vacuum thermal evaporation without much damage to the organic active layers. Such MoO3/Au/MoO3 trilayer electrodes have a maximum transmittance of nearly 90% at 600 nm and a sheet resistance of <10 ohms per square (Ω/sq) with a 10-nm thick Au intermediate layer. Using these trilayers as the top transparent anode, we have fabricated top-emitting OLEDs based on either a fluorescent or phosphorescent emitter, and observed nearly identical emission spectra and similar external quantum efficiencies as compared to the more conventional bottom-emitting OLEDs based on the commercial ITO anode. The power efficiency of the top-emitting devices is 20% to 30% lower than the bottom-emitting devices due to the somewhat inferior charge injection in the top-emitting devices. The performance and emission characteristics of these devices indicate that this trilayer structure is a promising candidate as a transparent anode in top-emitting OLEDs.

Paper Details

Date Published: 1 January 2011
PDF: 10 pages
J. Photon. Energy. 1(1) 011023 doi: 10.1117/1.3592886
Published in: Journal of Photonics for Energy Volume 1, Issue 1
Show Author Affiliations
Edward Wrzesniewski, Univ. of Florida (United States)
Sang-Hyun Eom, Univ. of Florida (United States)
William T. Hammond, Univ. of Florida (United States)
Weiran Cao, Univ. of Florida (United States)
Jiangeng Xue, Univ. of Florida (United States)

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