title: Multi-layer printing of OLEDs as a tool for the creation of security features.
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.
authors.affiliation: Department of Functional Materials and Devices, Fraunhofer Institute of Polymer Research, Geiselbergstr. 69, 14476 Potsdam, Germany.
authors.forename: Bert
authors.initials: B
authors.lastname: Fischer
authors.forename: Stefanie
authors.initials: S
authors.lastname: Kreissl
authors.forename: Christine
authors.initials: C
authors.lastname: Boeffel
authors.forename: Armin
authors.initials: A
authors.lastname: Wedel