Hamburg 2001 – wissenschaftliches Programm

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SYOF: Organische Festkörper

SYOF 5: Poster Session

SYOF 5.37: Poster

Dienstag, 27. März 2001, 17:00–19:00, Aula S3

Infrared spectroscopy of quinoline (III) complexes — •P.T. Giang¹, L.Q. Minh², M. Friedrich¹, and D.R.T. Zahn¹ — ¹Institut für Physik, TU Chemnitz, 09107 Chemnitz, Germany — ²Institute of Materials Science, Hanoi, Vietnam

Thin films of tris(8-hydroxyquinoline)aluminium (Alq₃) were deposited on silicon substrate by spin coating. Infrared spectroscopy was employed to investigate film properties. Agreement between film spectra and that of source material suggests that Alq₃ molecules did not undergo any change during the spin coating deposition process. Annealing of a film at high temperatures in vacuum showed that the film is stable up to 473 K. At 523 K the film thickness is reduced due to sublimation. Additionally, tris(8-hydroxyquinoline)erbium (Erq₃) was synthesised from Erbiumchloride and 8-hydroxyquinoline, then purified by sublimation in high vacuum. The infrared spectrum of Erq₃ is similar to that observed for Alq₃ in the range of organic ligand vibrtions from 700-1700 cm⁻¹. Deviations in the positions and intensities of infrared bands are caused by the influence of the central metal atom. Distinctions in the spectra are found in far infrared range due to stronger contribution of metal ions to metal-ligand vibrations. Furthermore, room temperature photoluminescence was observed at 1.5 µm due to intra-atomic transition between the ground and the first exited levels in the Er⁺³ ion.