23 October 2002 Rare earth doped synthetic opals and inverse opals
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Monodisperse spheres of silica and latex were obtained by a surfactant free styrene polimerization and the Stoeber method respectively. Controlling settling either by centrifugation or by dip-coating colloidal crystals could be obtained. Silica inverse opals were prepared by using the latex colloidal crystals as templates and TEOS/ethanol solution. Eu3+ containing silica spheres were obtained dispersing silica spheres in Eu(NO3)3 isopropanol solutions. Emission spectra suggest the formation of an amorphous Eu3+ containing phase well adhered at the spheres surface. The utilization of solutions of trifluoroacetates salts of Pb2+ and Eu3+ was observed to destroy the silica spherical pattern when samples are treated at 1000°C. In that case nanocrystals of PbF2 and amorphous silica were obtained after heat treatment
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Luciano A. Bueno, Luciano A. Bueno, Roberto Bertholdo, Roberto Bertholdo, Djalma A. Barros Filho, Djalma A. Barros Filho, Younes Messaddeq, Younes Messaddeq, Sidney J. L. Ribeiro, Sidney J. L. Ribeiro, "Rare earth doped synthetic opals and inverse opals", Proc. SPIE 4804, Sol-Gel Optics VI, (23 October 2002); doi: 10.1117/12.456543; https://doi.org/10.1117/12.456543

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