Berlin 2008 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 10: POSTERS New Materials, Organic Semiconductors
CPP 10.12: Poster
Monday, February 25, 2008, 16:45–19:00, Poster A
Optimization of Emission Color and Efficiency of Organic Light Emitting Diodes for Lighting Applications — •Stefan Seidel1,2, Ralf Krause1,2, Fryderyk Kozlowski2, Günter Schmid2, Arvid Hunze2, and Albrecht Winnacker1 — 1Department of Materials Science VI, University of Erlangen-Nuremberg, Germany — 2Siemens AG, CT MM 1, Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
In recent years the performance of organic light emitting diodes (OLEDs) has reached a level where OLED lighting presents an interesting application target. Research activities therefore focus amongst other things on the development of high efficient and stable white light emitting devices. We demonstrate how the color coordinates can be adjusted to achieve a warm white emission spectrum, whereas the OLED stack contains phosphorescent red and green dyes combined with a fluorescent blue one. Detailed results are presented with respect to a variation of layer thicknesses and dopant concentrations of the emission layers. Furthermore the influence of various dye molecules and hence different energy level alignments between host and dopants on color and efficiency will be discussed.