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CP: Chemische Physik
CP 29: Poster: Opto-elektrische und optische Eigenschaften organischer Materialien
CP 29.10: Poster
Monday, March 22, 1999, 18:00–20:00, R52/R72
High-Performance Photorefractive Polymers Based on Chromophores with Optimized Birefringence — •Klaus Meerholz1, Frank Würthner2, Armin Sautter2, Christophe Legrand1, Erwin Mecher1, and Rüdiger Wortmann3 — 1Physical Chemistry Department, University of Munich, Sophienstr. 11, 80333 Munich — 2Organic Chemistry Department II, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm — 3Physical Chemistry Department, University of Mainz, Jakob-Welder-Weg 11, 55099 Mainz
Recently, we investigated structure-property relationships for a series of merocyanine chromophores for photorefractive applications in low glass-transition polymeric materials. Exceptionally large photorefractive figures-of-merit were determined by electroabsorption measurements in diluted solution for the best chromophores. However, the high dipole moments of these chromophores caused problems related to solubility, compatibility and aggregation of the dyes in the poly(N-vinylcarbazole) photoconducting matrix. Now we achieved significant progress in the electric- field induced alignment of highly birefringent ATOP merocyanine chromophores by substituent variations. The new material we report shows unprecedented optical gain and high diffraction efficiency at low field strength and operates in the near infrared at wavelengths of commercially available laser diodes.