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Nanostructured, ITO-free electrodes for OLED emission control

Published online by Cambridge University Press:  06 June 2014

Arfat Pradana ,
Christian Kluge  and
Martina Gerken
Arfat Pradana
Affiliation:
Institute of Electrical and Information Engineering, Christian-Albrechts-Universität zu Kiel, Kaiserstr. 2, D-24143 Kiel, Germany
Christian Kluge
Affiliation:
Institute of Electrical and Information Engineering, Christian-Albrechts-Universität zu Kiel, Kaiserstr. 2, D-24143 Kiel, Germany
Martina Gerken
Affiliation:
Institute of Electrical and Information Engineering, Christian-Albrechts-Universität zu Kiel, Kaiserstr. 2, D-24143 Kiel, Germany
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Abstract

We demonstrated nanostructured, ITO-free anodes in flexible OLEDs using a combination of a composite organic-inorganic UV nanoimprint resist and a conductive, transparent polymer layer. Flexible OLEDs with grating anodes were fabricated on polycarbonate substrates. The nanoimprint resist was blended with 30% TiO2 nanoparticles in order to achieve a sufficient refractive index contrast to the polymer anode. It was periodically structured with a 370-nm period linear photonic crystal structure. PEDOT:PSS was spin-coated on as a polymer anode and structured in an oxygen plasma treatment. For OLED demonstration an organic emission layer (PPV-derivative “Super Yellow”) and a metal cathode (LiF/Al) were deposited. We observed successful waveguide mode extraction both in electroluminescence and photoluminescence for flat and bend substrates. The waveguide mode extraction angle varied slightly under bending. The combination of an inorganic-organic composite material with a conductive polymer transparent electrode is promising for improving the performance of ITO-free, flexible OLEDs.

Keywords

optoelectronicorganicnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1699: Symposium LL – Transparent Electrodes , 2014 , mrss14-1699-ll05-32
Copyright
Copyright © Materials Research Society 2014 

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References

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