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Proceedings Paper

Inkjet-printed polymer-based scattering layers for enhanced light outcoupling from top-emitting organic light-emitting diodes
Author(s): Armin Heinrichsdobler; Manuel Engelmayer; Daniel Riedel; Christoph J. Brabec; Thomas Wehlus
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Paper Abstract

High refractive index polymer-based scattering layers used as internal light extraction layers are a promising low-cost approach to enhance the luminous efficacy of organic light-emitting diodes (OLEDs). In order to avoid damaging of the OLED layers a structured and contactless deposition method for the polymer-based scattering layers is required. For enhanced lifetime of the devices the water diffusion through the scattering layer has to be eliminated by a structured patterning technique. Inkjet printing offers both a contactless and structured deposition. In this study we evaluate inkjet printing of nanocomposite polymer-based scattering layers for OLEDs. A detailed view on the material and process development is given. This involves an optimization of ink formulation, printing parameters as well as layer formation. The resulting haze values of the scattering layers at 550 nm vary between 40% and 90% for different layer thicknesses. The gain in external quantum efficacy of top-emitting OLEDs induced by light scattering compared to reference devices peaks at a factor of 2.3. The obtained results are discussed and verified by an optical volume scattering simulation model which will be presented in full detail. Also a parameter variation study and its impact on extraction efficiency will be shown.

Paper Details

Date Published: 25 August 2017
PDF: 14 pages
Proc. SPIE 10362, Organic Light Emitting Materials and Devices XXI, 103622B (25 August 2017); doi: 10.1117/12.2272976
Show Author Affiliations
Armin Heinrichsdobler, OSRAM OLED GmbH (Germany)
Friedrich-Alexander-Univ. Erlangen-Nuremberg (Germany)
Manuel Engelmayer, OSRAM OLED GmbH (Germany)
Univ. of Augsburg (Germany)
Daniel Riedel, OSRAM OLED GmbH (Germany)
Friedrich-Alexander-Univ. Erlangen-Nuremberg (Germany)
Christoph J. Brabec, Friedrich-Alexander-Univ. Erlangen-Nuremberg (Germany)
Bavarian Ctr. for Applied Energy Research (ZAE Bayern) (Germany)
Thomas Wehlus, OSRAM OLED GmbH (Germany)

Published in SPIE Proceedings Vol. 10362:
Organic Light Emitting Materials and Devices XXI
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

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