Obtenção e caracterização de filmes finos de poliamida 6 dopados com índio (III) e complexos de európio (III)

Abstract

In recent years, solid state lasers based in polymers and organic molecules have been object of numerous researches. In this work, we investigated the use of polyamide 6 as matrix to obtain fluorescent thin films through two different approaches: the doping with metals to be complexed by the polymer through the amide bonds, and subsequent to obtention of nanocrystals and the direct doping with rare earth complexes. The doping with metal was analized through the In+3 insertion in the polymer matrix by ion implantation and direct doping with indium chloride. The insertion of indium was not successful. It was carried out the synthesis of the complexes acetyl--acetonate/Eu+3, dimethyl sulfoxide/Eu+3, and phenylalanine/Eu+3, and the subsequent insertion in polyamide 6. The structural modifications had been followed by Rutherford Backscattering, Fourier Transform Infrared Spectroscopy and Raman Spectroscopy. The photoluminescence behavior of the complexes, the pristine and doped polymer thin films was also characterized. All the complexes show narrow emission peaks when excited with =395 nm, corresponding to the transitions 5D0→7F0-4 of the Eu+3 ions. Phenylalanine can be considered an excellent ligand to obtain photoluminescent complex, once this behaves in a similar way to the well known acetyl--acetonate/Eu+3 and dimethyl sulfoxide/Eu+3. The phenylalanine/Eu+3 complex spectrum does not present the same broad emission observed for pure phenylalanine. The obtained thin films of the polymer doped with these complexes presented luminescence typical of the Eu+3 ions and without matrix effect. We concluded that polyamide 6 is an excellent matrix to insert these complexes, which can be attributed its high glass transition temperature