Seminar Announcement: Wesley Cardoso Muscelli

Data pubblicazione: 29-giu-2015 10.21.43

Announcement

Thursday, 18 June 2015, 15:00

Sala Grande Palazzina B via alla Cascata 56/C

Sol-Gel materials for Photonics.

"The activities at the Mater Lumem Laboratory"

Wesley Cardoso Muscelli

Department of Chemistry, University of Sao Paulo,

FFCLRP, Ribeirão Preto,

SP, Brazil

Abstract

I will present the current scientific activities of the Mater Lumem research laboratory headed by Prof. Rogéria Rocha Gonçalves. Then I will introduce my PhD scientific activity in the framework of the Brazilian Scientific Mobility Program "Ciências sem Fronteiras".

I will presents some recent results regarding the synthesis, the structural and the optical characterizations of Pr³⁺/Yb³⁺ co-doped SiO₂/Nb₂O₅ and Tm³⁺/Yb³⁺ co-doped SiO₂/Ta₂O₅ nanocomposites prepared by sol gel method. XRD and FTIR analysis were carried out in order to elucidate the influence of rare earth content and the annealing temperature on the structure of the nanocomposites. Based on the photoluminescence analysis of the nanocomposites, it was noted the influence of annealing temperature and rare earth concentration on the luminescence properties. Moreover, we investigated ion-ion interaction as well as up- and downconversion processes

Keywords: Sol-gel method; Glass ceramics; Rare earth ions; Photoluminescence; Up-downconversion.