23 October 2002 Rare earth doped synthetic opals and inverse opals
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Abstract
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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