Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 57: Poster IIa

HL 57.5: Poster

Tuesday, March 8, 2005, 16:30–19:00, Poster TU E

Luminescence Quenching experiments in Thin Films of PTCDA and MePTCDI, — •André Holzhey, Karl Leo und Michael Hoffmann — TU Dresden, Institut für Angewandte Photophysik (IAPP), 01062 Dresden, Germany, www.iapp.de

CW and time resolved photoluminescence and luminescence quenching of 3,4:9,10-perylene-tetracarboxylic-dianhydride (PTCDA) and N,N’-dimethylperylene-3,4:9,10-dicarboximide (MePTCDI) thin layers show a dependence on the evaporation process, especially due to different degeneration of layers for different multilayer structures. Investigation of these dependencies allows to compare current measurements to previous results of exciton diffusion experiments by R. Schüppel [1]. It permits a more detailed view on exciton diffusion parameters of PTCDA and MePTCDI and on the diffusion mechanism. Using a spectrofluorometer and a revised streak camera setup, the surface luminescence quenching in double layers is investigated for various layer thicknesses, excitation energies and temperatures. The dependence on excitation energy allows conclusions about the interplay between exciton relaxation and diffusion.

[1] R. Schüppel, T. Dienel, K. Leo and M. Hoffmann, J. Lum., in press (2004)