Berlin 2008 – scientific programme

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DS: Fachverband Dünne Schichten

DS 36: Vibrational Spectroscopy of Nanolayers with Optical Probes

DS 36.5: Talk

Friday, February 29, 2008, 11:45–12:00, H 2013

IR spectroscopy for degradation studies of OLED emitter materials — •Martin Binder and Annemarie Pucci — Kirchhoff-Institut für Physik, Universität Heidelberg

We are doing Infrared Spectroscopy on new emitter materials for highly efficient organic light diodes (OLEDs). These materials are small organic molecules. In our experiments we can evaporate these molecules under UHV conditions on silicon and do IR spectroscopy in situ. Our special interest lies on the stability of the molecules, for example their behaviour under UV irradiation is investigated. Degradation of OLEDs is still one of the big challenges in that field and a consistent explanation is missing. During irradiation with UV light the photoluminescence is observed and, as it is well known, the luminescence is decreasing. We found a relativly strong loss in luminescence and much smaller changes in the IR spectra of the layers.