News & Press Releases

Scientific Colloquium on efficient electron injection from a Li3PO4/Al cathode into OLEDs

Dr. Andrea Gassmann at Novaled GmbH, 30th April 2014,  1 p.m., Biotechnologie Zentrum, Novaled meeting room 3rd floor

The functionality of organic light emitting diodes (OLEDs) relies on the interplay of multiple physical phenomena and materials. Among these the charge carrier injection from the electrodes is key. The goal is to have a well injecting material or material combination that is at the same time rather stable against oxygen and humidity. Commonly used cathode materials like calcium do not comply with the latter demand and have been usually replaced by a LiF / Al electrode. Yet, LiF is a hygroscopic material thus motivating a still continuing search for alternative cathodes.

The present work will address an alternative system - Li3PO4 / Al - that is competitive to the benchmark system LiF / Al and allows for longer lifetimes of the devices. The underlying functional principle of the Li3PO4 / Al cathode will be discussed in detail. It will be shown that the partial orientation of interface dipoles resulting from an interface reaction might be the reason for the observed work function decrease and the good electron injection properties.

About the Speaker:

Dr. Andrea Gassmann
Technische Universität Darmstadt, Materials Science and Geoscience Department, Electronic Materials Division (Prof. von Seggern), Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany

Since 2010:PostDoc and leader of research group on Organic Electronics at TU Darmstadt
2006-2010:Doctorate in Materials Science at TU Darmstadt
2006:Diploma in Materials Science at TU Darmstadt



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