Regensburg 2007 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 1: Organic Thin Films I

DS 1.6: Vortrag

Montag, 26. März 2007, 10:45–11:00, H32

Photochromism in thin spiropyran films — •Michael Karcher, Celine Elsäßer, Christoph Rüdt, Martin Schübbe, and Paul Fumagalli — Freie Universität Berlin, Deutschland

Photochromic molecules are reversibly switchable molecules that can be both addressed and read out using light. Possible applications are optical memory devices and smart materials [1]. Thin films of 6-nitro derivatives of the spiropyrans have been prepared using thermal evaporation under high vacuum conditions on different substrates. The photochromism of the films has been studied using optical absorption spectroscopy in the UV-VIS range. Reversible switching by light irradiation between the spiropyran and the merocyanine state was observed.

Steady-state transmission spectra of 10 to 40 nm thick films on quartz and magnesium-oxide substrates will be shown for both the spiropyran ground state as well as the metastable merocyanine state. Furthermore, the switching kinetics on a time scale of seconds will be presented.

[1] Chem. Rev. 100, 1741-1753 (2000)