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Study of upconversion processes in nanostructured materials based on rare earth doped GeO2-Ta2O5 with high emission quantum yield

Grant number: 19/25991-6
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): February 01, 2020
Effective date (End): April 22, 2020
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
Principal Investigator:Rogéria Rocha Gonçalves
Grantee:Fábio José Caixeta
Supervisor abroad: Maria Rute de Amorim e Sa Ferreira Andre
Home Institution: Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
Local de pesquisa : Universidade de Aveiro (UA), Portugal  
Associated to the scholarship:17/10423-7 - Broad band NIR emission from nanostructured Rare earth doped Nb2O5 and Ta2O5 derived materials for photonic applications as optical amplifiers and energy converters., BP.DR


This research project presents the programmed activities for the BEPE internship in collaboration with professor Maria Rute Ferreira research group at CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro, Portugal. The internship will continue the PhD project and strengthen the existing collaboration between the Laboratório de Materiais Luminescentes Micro e Nanoestruturados (Mater Lumen) at Department of Chemistry, FFCLRP-USP and the CICECO research institute. In CICECO will be performed structural, spectroscopic and optical characterizations of the RE co-doped tantalum oxide (Ta2O5) based nanocomposites. These materials exhibit visible emission, due to upconversion processes, similar to fluorides, the most efficient upconverters materials. This proposal aims to perform emission quantification measures (quantum yield and luminous flux) using integrating spheres. In addition, it is intended to conduct a systematic study correlating structure of matter with morphological, structural, spectroscopic and optical properties. In collaboration with Dr. Albano N. Carneiro Neto (H: 6 index) and Professor Oscar L. Malta (H: 45 index), calculations of energy transfer processes between rare earth ions (RE) and theoretical and experimentaL quantum yields will be evaluated. The spectroscopic characterization as a function of composition, doping and structure represent the basis of this research project.