Berlin 2005 – wissenschaftliches Programm
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SYOO: Organic Optoelectronics and Photonics
SYOO 6: Poster
SYOO 6.7: Poster
Montag, 7. März 2005, 18:00–20:00, Poster TU A
Daylight stability of organic light emitting diodes — •Roland Schmechel1, Gabi Andress1, Heinz von Seggern1, Holger Heil2, Jürgen Steiger2, Klaus Bonrad3, and Rüdiger Sprengard3 — 1TU-Darmstadt, Institut für Materialwissenschaft, Petersenstr.23, D-64287 Darmstadt — 2Covion Organic Semiconductors GmbH, D-65926 Frankfurt am Main, Germany — 3SCHOTT AG, Div. Luminescence Technology, D-55014 Mainz, Germany
This work reports on the photo-degradation of organic light emitting diodes (OLEDs) due to exposure to visible and near-ultraviolet light. Such exposure affects strongly the device performance, e.g., the electroluminescence intensity and the device current decrease considerably, however, the photoluminescence remains unaffected. This photo-degradation was investigated on various production-relevant classes of high quality polymer semiconductors with different energy gaps, i.e. a yellowish-green polyphenylenevinylene derivative, a red polyfluorene derivative and a blue polyspiro derivative. It will be demonstrated that the action spectrum of the photo-degradation is strongly correlated with the fundamental absorption of the polymer itself. The ITO/polymer interface was identified as the interface where photo-degradation takes place, while the bulk of each layer (ITO or polymer) turned out to be insensitive to irradiation with visible or near-ultraviolet light. Further it is demonstrated that the photo-induced damage can be suppressed by inserting appropriate interlayer systems.