Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 23: POSTER Functional Organic Thin Films
CPP 23.35: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
Enhancement of light out-coupling for OLEDs — •Dirk Buchhauser1,2, Christoph Gaerditz1,3, Ralph Paetzold1, OIiver Weiss1,4, Joachim Wecker1, and Juergen Ruediger Niklas2 — 1Siemens AG, Corporate Technology, Günther Scharowsky Str. 1, 91058 Erlangen, Germany — 2Department of Experimental Physics, University of Freiberg, Silbermannstrasse 1, 09599 Freiberg, Germany — 3Department of Material Science VI, University Erlangen-Nuremberg, Germany — 4Department of Materials Science, Technical University of Darmstadt, Petersenstraße 23, 64287 Darmstadt, Germany
OLED technology is attracting more and more attention for lighting applications, because they provide striking advantages over competing technologies and can cover completely new application fields by offering a new freedom in design and shape for next generation lighting. Large area OLEDs might hence be used as 2-dimensional light sources which are thin and lightweight while providing diffuse illumination. OLEDs for illumination require brightness levels of 1000 cd/m2 or more and an active area in the order of tens of cm2. The efficiency of the lighting tiles can be significantly enhanced by using scattering structures on top of the substrate in order to improve the out-coupling behavior. Furthermore, such scattering layers can provide improved color stability over the entire viewing angle. Scattering layers are realized by films containing a certain concentration of particles or by physically structured surfaces. We present results on OLEDs based on white light-emitting polymers. The impact of scattering foils for light extraction and angular color stability are analyzed compared with simulations.