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New Findings Reported from Karlsruhe Institute of Technology Describe Advances in Materials Science

June 24, 2014

By a News Reporter-Staff News Editor at Journal of Technology -- Investigators publish new report on Materials Science. According to news reporting originating from Eggenstein Leopoldshafen, Germany, by VerticalNews correspondents, research stated, "We study two types of water/alcohol-soluble aliphatic amines, polyethylenimine (PEI) and polyethylenimine-ethoxylated (PETE), for their suitability as electron injection layers in solution-processed blue fluorescent organic light-emitting diodes (OLEDs). X-ray photoelectron spectroscopy is used to determine the nominal thickness of the polymer layers while ultraviolet photoelectron spectroscopy is carried out to determine the induced work-function change of the silver cathode."

Our news editors obtained a quote from the research from the Karlsruhe Institute of Technology, "The determined work-function shifts are as high as 1.5 eV for PEI and 1.3 eV for PEIE. Furthermore, atomic force microscopy images reveal that homogeneous PEI and PEIE layers are present at Finally, we solution prepare blue emitting polymer-based OLEDs using PEI/PEIE in combination with Ag as cathode layers. Luminous efficiency reaches 3 and 2.2 cd A(-1), whereas maximum luminance values are as high as 8000 and 3000 cd m(-2) for PEI and PETE injection layers, respectively."

According to the news editors, the research concluded: "The prepared devices show a comparable performance to Ca/Ag OLEDs and an improved shelf lifetime."

For more information on this research see: Investigation of Solution-Processed Ultrathin Electron Injection Layers for Organic Light-Emitting Diodes. ACS Applied Materials & Interfaces, 2014;6(9):6616-6622. ACS Applied Materials & Interfaces can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; ACS Applied Materials & Interfaces -

The news editors report that additional information may be obtained by contacting S. Stolz, Karlsruhe Inst Technol, Inst Microstruct Technol, D-76344 Eggenstein Leopoldshafen, Germany. Additional authors for this research include M. Scherer, E. Mankel, R. Lovrincic, J. Schinke, W. Kowalsky, W. Jaegermann, U. Lemmer, N. Mechau and G. Hernandez-Sosa.

Keywords for this news article include: Europe, Germany, Materials Science, Eggenstein Leopoldshafen

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Source: Journal of Technology

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