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Segmented transparent OLED devices on ultra-thin glass

: Wang, Dongxiang; Stanel, Michael; Saini, Paritosh; Keibler-Willner, Claudia; Hauptmann, Jacqueline; Täschner, Kerstin; Junghähnel, Manuela; Mogck, Stefan

Schottner, G. ; International Council for Coatings on Glass e.V. -ICCG-; Fraunhofer-Institut für Silicatforschung -ISC-, Würzburg; Vincentz Network GmbH & Co. KG, Hannover:
Advanced coatings for large-area or high-volume products. The 12th International Conference on Coatings on Glass and Plastics : ICCG 12. CD-ROM : June 11-15, 2018, Conference Center Würzburg, Germany
Würzburg: Fraunhofer ISC, 2018
S.16-20 (Session 4)
International Conference on Coatings on Glass and Plastics (ICCG) <12, 2018, Würzburg>
Fraunhofer FEP ()
ultra-thin glass; OLED-lighting; OLED; Roll-to-Roll manufacturing

Large area animated light applications for pixel based OLED signage have a high potential to build a bridge between lighting and display applications. In this context, Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP is involved in the internal Fraunhofer project CeGlaFlex. This initiative focuses on the production of flexible electronical components for OLED devices and switchable elements on ultra-thin glass and transparent ceramics. FEP therefore functions as the R&D platform to fulfill this purpose, providing its expertise in S2S and R2R OLED technology as well as the inorganic and organic thin-film coating.
The main targets for FEP in CeGlaFlex are improvements of light out-coupling and the implementation of inorganic, transparent thin layers to reduce total internal reflection at interfaces by matching the refractive indices of the thin film layer stack. For this reason, optical simulations are performed to increase the light out-coupling and to minimize angular dependencies. This process is expected to improve the understanding of the light outcoupling behavior at interfaces of the OLED layer stack, ultra-thin glass, adhesion layer and thin transparent ceramics.
The paper will outline the present status of Rollto-Roll (R2R) OLED deposition on ultra-thin glass with the focus on transparent OLED devices and how to perform segmentation by printing of silver- and dielectric pastes. Ultra-thin glass is laminated on a PET film to avoid fabrication interruptions when glass cracks occur during the Roll-to-Roll process. The advantages and drawbacks using ultra-thin glass as a substrate will be pointed out.