Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.43: Poster

Montag, 14. März 2011, 17:30–19:30, P2

Temperature dependent relaxation processes in MDMO-PPV films — •Henry Alberto Mendez Pinzon¹, Clara Patricia Hernandez Moreno², and Juan Carlos Salcedo Reyes¹ — ¹Thin Films Group, Pontificia Universidad Javeriana, Bogotá (Kolumbien) — ²Electronics Engineering Department, Pontificia Universidad Javeriana, Bogotá (Kolumbien)

Thin films of the electroluminescent polymer MDMO-PPV were deposited on glass by means of the Doctor Blade technique. The behavior of radiative relaxation processes in MDMO-PPV films were characterized by a combination of photoluminescence and transmittance measurements in a wide range of temperatures (13K to 400K). From both types of optical measurements an unusual increase of the optical bandgap was observed. A further analysis of the spectra allows deducing structural changes in the organic film, involving segmentation of the polymeric chains, and giving rise to an improvement in the ordering of the electroluminescent layer as temperature increases. In this way, monochromatic emission from the polymer is favored after annealing.