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Multi-layer printing of OLEDs as a tool for the creation of security features

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Abstract

The combined deposition of structured and homogenous layers for the device setup of OLEDs results in a structured display visible with a gray scale impression. These permanently imprinted structures are only visible during the application of an electrical field and almost invisible in the off state. Most intriguing applications of such devices are security marks, electronic watermarks but also for advertising and design applications the creation of gray scale structures might have interesting applications.

©2012 Optical Society of America

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Figures (4)

Fig. 1
Fig. 1 Schematic device setup (shown without backside encapsulation, not drawn to scale). The structured inkjet printed layer could either be a hole injection layer or an emitting layer (drawn in red), the hole injection and emitting can be either spin coated or applied by other uniform coating techniques such as inkjet printing or slot die coating.
Fig. 2
Fig. 2 Multi-layer printed OLED in the on mode, the structure is permanently written in by inkjet printing a second hole injection layer. In the off-mode the structure is not visible. The left hand picture shows the logo of the Institute, the right hand picture shows a detail of a sketch. Around the printed contours (blue arrows) several points (black arrows) are visible showing failure of the print head with not accurately printing nozzles leading to a contrast outside the wanted contour lines of the image layout.
Fig. 3
Fig. 3 Printed image in using a blue and red fluorescent polymer as emitting layer.
Fig. 4
Fig. 4 Printed image with a green emitting layer in the on- (left) and off-mode (right). Almost no contrast variations are visible in the off-state, in contrast to the pixel structure resulting from the photolithographic structuring of the ITO-electrode.
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