Obtención de nuevos materiales híbridos orgánico-inorgánicos fotosensibles utilizables como láseres de colorante en estado sólido

[EN] The synthesis of new materials of hybrid character (organic-inorganic) doped with dyes results highly attractive like active medium in solid state laser in which the excellent thermal properties of the inorganic glasses with the excellent optic properties of the polymeric materials could be combined. Through a simultaneous synthesis process of sol-gel policondensation of the inorganic TEOS during the free radical polymerization of the organic part (vinylic or acrylic monomers with OH groups), since the presence of this -OH side groups in the organic monomer can participate in the policondensation process of silanols, hybrids monoliths were able to be obtained as solid-state dye laser matrices. The synthesis and characterization of new hybrid matrices were carried out incorporating pirromethene 567 (PM567) into polymers of 2-hydroxyethyl methacrylate (HEMA) and copolymers of HEMA and methyl methacrylate (MMA) with different weight proportions of the inorganic component, tetraethoxysilane (TEOS). The first results obtained with this new materials are indicave that the addition of low proportions of TEOS into the polymer P(HEMA/MMA 1/1) increases its thermal stability reducing the thermal degradation of the dye and, consequently, improving significantly its laser action. In fact, some of the results achieved with these new materials represent the best photostability reached to date for PM567 incorporated into inorganic and hybrid materials and, taking into account the experimental pumping conditions, improve or at least, compare well, with the lasing properties of the dye embedded in other host polymeric matrices.