Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: POSTERS New Materials, Organic Semiconductors

CPP 10.12: Poster

Montag, 25. Februar 2008, 16:45–19:00, Poster A

Optimization of Emission Color and Efficiency of Organic Light Emitting Diodes for Lighting Applications — •Stefan Seidel^1,2, Ralf Krause^1,2, 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.