Rare earth doped synthetic opals and inverse opals
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Data
2002-01-01
Autores
Bueno, L. A.
Bertholdo, R.
Barros, D. A.
Messaddeq, Younes [UNESP]
Ribeiro, SJL
Título da Revista
ISSN da Revista
Título de Volume
Editor
Spie - Int Soc Optical Engineering
Resumo
Monodisperse spheres of silica and latex were obtained by a surfactant free styrene polimerization and the Stober 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 1000degreesC. In that case nanocrystals of PbF2 and amorphous silica were obtained after heat treatment.
Descrição
Palavras-chave
opals, inverse opals, lanthanide ions
Como citar
Sol-gel Optics Vi. Bellingham: Spie-int Soc Optical Engineering, v. 4804, p. 121-129, 2002.