Hamburg 2001 – scientific programme
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SYOF: Organische Festkörper
SYOF 5: Poster Session
SYOF 5.40: Poster
Tuesday, March 27, 2001, 17:00–19:00, Aula S3
Color characterization of organic light emitting diodes (OLEDs) — •Ralph Paetzold1, J. Birnstock1, J. Blaessing1, K. Heuser1, M. Stoessel1, G. Wittmann1, D. Lacey2, H. Becker3, and G. Leuchs4 — 1CT MM 1, Paul-Gossen-Str. 100, 91056 Erlangen — 2Osram Opto Semiconductors, c/o Siemens AG, CT MM 1, Paul-Gossen-Str.100, 91056 Erlangen — 3Covion Organic Semiconductors GmbH, Industrial Park Hoechst, G865, 65926 Frankfurt/Main — 4Universitaet Erlangen-Nuernberg, Physikalisches Institut, Staudtstr. 7, 91058 Erlangen
The use of functional polymers for multi or full color passive-matrix displays is becoming more attractive as an emissive display technology. To compete with LCD, full color OLED displays have to achieve a similar color gamut with red, green and blue emitting polymers meeting all stability requirements under a variety of environmental conditions. Previous work (T.-W. Lee et. al., Adv. Mater. 12, No.11, 801 (00); H. Becker et. al., Phys. Rev. B56, 1893 (97)) addresses the influence of fabrication conditions on the electro- and photoluminescent properties. In our work, we studied the effect of thermochromism, viewing angle and polarisation on color properties of OLED devices based on soluble poly-(p-phenylenevinylene) (PPV) derivatives and the influence of brightness or ambient light. Furthermore, color shifts during driving at different temperatures were evaluated. Using a variety of techniques and modifying the device structure it is possible to distinguish between device effects (e.g. micro cavity effects) and intrinsic properties of the functional polymer itself.