Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 23: POSTER Functional Organic Thin Films

CPP 23.5: Poster

Thursday, March 30, 2006, 17:00–19:00, P2

Optical spectroscopy of vapour deposited rubrene films — •Olga Krylova, Andreas Langner, and Moritz Sokolowski — Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, 53115 Bonn, Germany

Thin films of rubrene (150 nm) were fabricated by vapour deposition on glass and the absorption and fluorescence spectra were investigated as a function of temperature. We observe a reversible red-shift of the emission maximum of 500 cm⁻¹ at about 150-200 K. Interestingly, a similar change has been observed in the fluorescence spectra of thin tetracene films earlier and was attributed to a structural phase transition [1]. However, since rubrene films deposited at room temperatures were identified as amorphous [2], the origin of this shift may have a different origin for rubrene, which will be discussed. Supported by the DFG through the research unit 557.

[1] H. Nishimura et al., J. Phys. Soc. Japan 54 (1985) 4.

[2] D. Käfer, G. Witte, Phys. Chem. Chem. Phys. 7(15) (2005) 2850.