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Advances in Materials Science and Engineering
Volume 2012, Article ID 385178, 15 pages
Research Article

Polystyrene Backbone Polymers Consisting of Alkyl-Substituted Triazine Side Groups for Phosphorescent OLEDs

1Department of Polymers and Electronics, Fraunhofer Institute for Applied Polymer Research, Geiselbergstraße 69, 14476 Potsdam, Germany
2Department of Chemistry, Humboldt University, Brook-Taylor-Straße 2, 12489 Berlin, Germany
3Merck KGaA, Frankfurter Straße 250, 64293 Darmstadt, Germany

Received 9 March 2012; Accepted 16 April 2012

Academic Editor: Etienne Baranoff

Copyright © 2012 Beatrice Ch. D. Salert et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper describes the synthesis of new electron-transporting styrene monomers and their corresponding polystyrenes all with a 2,4,6-triphenyl-1,3,5-triazine basic structure in the side group. The monomers differ in the alkyl substitution and in the meta-/paralinkage of the triazine to the polymer backbone. The thermal and spectroscopic properties of the new electron-transporting polymers are discussed in regard to their chemical structures. Phosphorescent OLEDs were prepared using the obtained electron-transporting polymers as the emissive layer material in blend systems together with a green iridium-based emitter 13 and a small molecule as an additional cohost with wideband gap characteristics (CoH-001). The performance of the OLEDs was characterized and discussed in regard to the chemical structure of the new electron-transporting polymers.