Special Section on Organic Light-Emitting Materials and Devices

Transparent oxide/metal/oxide trilayer electrode for use in top-emitting organic light-emitting diodes

[+] Author Affiliations
Edward Wrzesniewski

University of Florida, Department of Materials Science and Engineering, Gainesville, Florida 32611–6400

Sang-Hyun Eom

University of Florida, Department of Materials Science and Engineering, Gainesville, Florida 32611–6400

William T. Hammond

University of Florida, Department of Materials Science and Engineering, Gainesville, Florida 32611–6400

Weiran Cao

University of Florida, Department of Materials Science and Engineering, Gainesville, Florida 32611–6400

Jiangeng Xue

University of Florida, Department of Materials Science and Engineering, Gainesville, Florida 32611–6400

J. Photon. Energy. 1(1), 011023 (May 23, 2011). doi:10.1117/1.3592886
History: Received September 01, 2010; Revised April 12, 2011; Accepted May 02, 2011; Published May 23, 2011; Online May 23, 2011
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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.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Edward Wrzesniewski ; Sang-Hyun Eom ; William T. Hammond ; Weiran Cao and Jiangeng Xue
"Transparent oxide/metal/oxide trilayer electrode for use in top-emitting organic light-emitting diodes", J. Photon. Energy. 1(1), 011023 (May 23, 2011). ; http://dx.doi.org/10.1117/1.3592886


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