Berlin 2012 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 85: Organic Semiconductors: Transistors and OLEDS
HL 85.9: Talk
Thursday, March 29, 2012, 17:15–17:30, EW 203
Investigation of degradation mechanisms of Organic-Light-Emitting Diodes — •Mustapha Al Helwi1,2,4, Alexander Badinski2, Ute Heinemeyer2, Soichi Watanabe2, Gerhardt Wagenblast2, Ingo Münster2, and Wolfgang Kowalsky1,3,4 — 1KIP, Universität Heidelberg, Heidelberg, Deutschland — 2BASF SE, Ludwigshafen, Deutschland — 3IHF, Technische Universität Braunschweig, Braunschweig, Deutschland — 4Innovation Lab GmbH, Heidelberg, Deutschland
Organic Light Emitting Diodes (OLEDs) are self-luminescent thin films of organic molecules used for lighting and display applications. This innovative technology will revolutionize the world as we know it today. The OLEDs are flexible, transparent, printable, and thus cost-efficective to produce.
As with all new technologies, OLED brings it own challenges in terms of functional description and understanding of physical parameters. Efficient, stable, primary colors (red, green, blue) emitting molecules are essential requirements of this technology. The improvement of the diodes lifetime by understanding of degradation mechanisms, especially for the phosphorescent blue diode, is one of the most important yet unresolved issue.
In this talk, a lifetime measurement method and first results will be presented. The application of various analytical methods such as impedance spectroscopy on a degradated device will be shown. A theoretical model describing the aging of the organic layers will be explained and used for fitting of experimental data. The interplay between experiment and modeling helps the discrimination and quantification of degradation allowing a deeper understanding of the OLED stability.