White organic light-emitting diodes with 4 nm metal electrode
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We investigate metal layers with a thickness of only a few nanometers as anode replacement for indium tin oxide (ITO) in white organic light-emitting diodes (OLEDs). The ultrathin metal electrodes prove to be an excellent alternative that can, with regard to the angular dependence and efficiency of the OLED devices, outperform the ITO reference. Furthermore, unlike ITO, the thin composite metal electrodes are readily compatible with demanding architectures (e.g., top-emission or transparent OLEDs, device unit stacking, etc.) and flexible substrates. Here, we compare the sheet resistance of both types of electrodes on polyethylene terephthalate for different bending radii. The electrical performance of ITO breaks down at a radius of 10 mm, while the metal electrode remains intact even at radii smaller than 1 mm.
Lenk , S , Schwab , T , Schubert , S , Müller-Meskamp , L , Leo , K , Gather , M C & Reineke , S 2015 , ' White organic light-emitting diodes with 4 nm metal electrode ' Applied Physics Letters , vol. 107 , no. 16 , 163302 . DOI: 10.1063/1.4934274
Applied Physics Letters
© 2015 AIP Publishing LLC. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.1063/1.4934274
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