Issue 8, 2020

All solution-processed ITO free flexible organic light-emitting diodes


Roll-to-roll (R2R) printing and coating techniques can be used for low cost and large-area mass production of organic electronic devices. While research in the photovoltaic field has developed R2R printed large-scale solar modules, research in solution-processed OLEDs has not progressed as far yet. In this work, we investigate all-solution processed OLEDs based on ink-jet printed silver bottom electrodes and spin-coating of all other layers. Ink-jet printing provides the advantages of mask-free patterning and non-contact manufacturing. As the top electrode, a conductive PEDOT:PSS formulation easily processable on organic layers due to a low contact angle is utilized. The all-solution processed top-emitting OLEDs achieve high luminance (7 000 cd m−2) and an efficiency close to that of reference devices with evaporated electrodes: 4.2 cd A−1vs. 7.6 cd A−1, respectively. The shelf stability is also tested and after seven months, the all solution-processed encapsulated OLED retains 82% of its initial EQE.

Graphical abstract: All solution-processed ITO free flexible organic light-emitting diodes

Article information

Article type
18 Aug 2020
16 Sep 2020
First published
23 Sep 2020
This article is Open Access
Creative Commons BY license

Mater. Adv., 2020,1, 2755-2762

All solution-processed ITO free flexible organic light-emitting diodes

Y. Murat, K. Petersons, D. Lanka, L. Lindvold, L. Yde, J. Stensborg and M. Gerken, Mater. Adv., 2020, 1, 2755 DOI: 10.1039/D0MA00618A

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