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1 January 2011 Transparent oxide/metal/oxide trilayer electrode for use in top-emitting organic light-emitting diodes
Edward Wrzesniewski III, Sang-Hyun Eom, William T. Hammond, Weiran Cao, Jiangeng Xue
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Journal of Photonics for Energy, Vol. 1, Issue 1, 011023 (January 2011). https://doi.org/10.1117/1.3592886
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.
© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE) 1947-7988/2011/1(1)/011023/9/$25.00
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Edward Wrzesniewski III, 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," Journal of Photonics for Energy 1(1), 011023 (1 January 2011). https://doi.org/10.1117/1.3592886
Published: 1 January 2011
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Cited by 17 scholarly publications and 3 patents.
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KEYWORDS
Electrodes
Transmittance
Organic light emitting diodes
Gold
Resistance
Metals
Silver
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