Issue 8, 2020

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

Abstract

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
Paper
Submitted
18 Aug. 2020
Accepted
16 Sept. 2020
First published
23 Sept. 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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