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MO: Fachverband Molekülphysik

MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets

MO 21.14: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.IV

Optical switching of an organic photochromic triad: Demonstration of an optical gate — •Martti Pärs¹, Michael Gradmann¹, Regina Schmidt¹, Christiane Hofmann¹, Katja Gräf², Peter Bauer², Mukundan Thelakkat², and Jürgen Köhler¹ — ¹Experimental Physics IV, University of Bayreuth, 95440 Bayreuth, Germany — ²Applied Functional Polymers, University of Bayreuth, 95440 Bayreuth, Germany

We demonstrate the operation of an optical gate by using an organic triad, that consists of a photochromic unit (dithienylcyclopentene, DCP) and two highly efficient fluorophores (perylenebisimide, PBI). The DCP can be reversibly interconverted between two bistable forms by light, leading to a strong modulation of the fluorescence intensity of PBI moieties as a function of the state of the DCP. Hence the DCP unit acts as a gate (triggered by few photons), that controls the flow of many fluorescence photons from the PBI. We will discuss the performance of the triad (modulation depth of the fluorescence, fatigue resistance and quantum yield) from the viewpoint of an optical transistor.

Reference: M. Pärs, C.C. Hofmann, K. Willinger, P. Bauer, M. Thelakkat, J. Köhler, Angew. Chem. Int. Ed. 2011, 50, 11405-11408