Regensburg 2007 – wissenschaftliches Programm
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.70: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
High efficient white Organic Light Emitting Diodes — •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, Günter-Scharowsky-Str. 1, 91058 Erlangen, Germany
Due to the rapid progress in the last years the performance of organic light emitting diodes (OLEDs) has reached a level where general lighting presents a most interesting application target. We demonstrate, how the color coordinates of the emission spectrum can be adjusted using a combinatorial evaporation tool to lie on the desired black body curve representing cold and warm white, respectively. The evaluation includes phosphorescent and fluorescent dye approaches to optimize lifetime and efficiency, simultaneously. Detailed results are presented with respect to variation of layer thicknesses and dopant concentrations of each layer within the OLED stack. The most promising approach contains phosphorescent red and green dyes combined with a fluorescent blue one as blue phosphorescent dopants are not yet stable enough to achieve long lifetimes. This work has been supported by the German Federal Ministry of Education and Research (BMBF) within the framework of the OPAL project.