Regensburg 2007 – scientific programme
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DS: Fachverband Dünne Schichten
DS 15: Poster Session
DS 15.2: Poster
Tuesday, March 27, 2007, 15:00–17:00, Poster B
Optical Properties of Spiro-linked Organic Thin Films — •Simona Silaghi1, Till Spehr2, Christoph Cobet1, Christoph Werner1, Josef Salbeck2, Sven Peters3, Walter Braun4, and Norbert Esser1 — 1ISAS - Institute for Analytical Sciences, Department Berlin, D-12489 Berlin, Germany — 2Institut für Chemie, Universität Kassel, D-34132 Kassel, Germany — 3SENTECH Instruments GmbH, D-12489 Berlin, Germany — 4BESSY-GmbH, D-12489 Berlin, Germany
Spiro-linked organic materials are very stable candidates [1] for organic optoelectronics and can be employed in charge transport and emitting layers of organic light-emitting diodes [2] as well as solid-state lasers [3]. Particularly, information about the effective refractive index is needed in the case of spiro-linked organic solid-state UV-lasers based on distributed feedback resonators [3]. Therefore, spectroscopic ellipsometry method is employed here in the energy range from 1.4 to 9.5 eV to extract accurate information about the optical properties of such spiro-linked organic thin films of Octo1 (2,2’,4,4’,7,7’-hexaphenyl-9,9’-spirobifluorene) and Octo2 (2,2’,4,4’,7,7’-hexakis(biphenyl-4-yl)-9,9’-spirobifluorene) grown on silicon substrates. [1] J. Salbeck, N. Yu, J. Bauer, F. Weissörtel, H. Bestgen, Synth. Met. 91 (1997) 209 [2] D. Gebeyehu, K. Walzer, G. He, M. Pfeiffer, K. Leo, J. Brandt, A. Gerhard, P. Stößel, H. Vestweber, Synth. Met. 148 (2005) 205 [3] T. Spehr, A. Siebert, T. Fuhrmann-Lieker, J. Salbeck, T. Rabe, T. Riedl, H.H. Johannes, W. Kowalsky, J. Wang, T. Weimann, P. Hinze, Appl. Phys. Lett. 87 (2005) 161103