Rare-earth-doped synthetic opals and inverse opals

Luciano A. Bueno; Roberto Bertholdo; Djalma A. Barros Filho; Younes Messaddeq; Sidney J. L. Ribeiro

doi:10.1117/12.456543

23 October 2002 Rare earth doped synthetic opals and inverse opals

Luciano A. Bueno, Roberto Bertholdo, Djalma A. Barros Filho, Younes Messaddeq, Sidney J. L. Ribeiro

Proceedings Volume 4804, Sol-Gel Optics VI; (2002) https://doi.org/10.1117/12.456543
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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

Citation Download Citation

Luciano A. Bueno, Roberto Bertholdo, Djalma A. Barros Filho, Younes Messaddeq, and Sidney J. L. Ribeiro "Rare earth doped synthetic opals and inverse opals", Proc. SPIE 4804, Sol-Gel Optics VI, (23 October 2002); https://doi.org/10.1117/12.456543

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