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 Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: February 01, 2020
• End date: April 22, 2020
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Rogéria Rocha Gonçalves
• Grantee: Fábio José Caixeta
• Supervisor: Maria Rute de Amorim e Sá Ferreira André
• Host Institution: Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
• Institution abroad: 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

Abstract

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. (AU)

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

LABAKI, HAYRA DO PRADO; CAIXETA, FABIO JOSE; GONCALVES, ROGERIA ROCHA. Wide multicolor tunability of blue-to-green up-conversion emission and white light generation in Pr3+/Yb3+ co-doped yttrium tantalates. Journal of Luminescence, v. 245, p. 11-pg., 2022-05-01. (20/05319-9, 17/10423-7, 19/25991-6)

LABAKI, H. P.; BORGES, F. H.; CAIXETA, F. J.; GONCALVES, R. R.. Widely dual tunable visible and near infrared emission in Pr3+-doped yttrium tantalate: Pr3+ concentration dependence on radiative transitions from P-3(0) to the D-1(2). Journal of Luminescence, v. 236, AUG 2021. (20/05319-9, 17/10423-7, 19/25991-6, 18/04587-0, 17/10424-3)

LABAKI, HAYRA DO PRADO; CAIXETA, FABIO JOSE; MARQUES, NATASHA POLICEI; JOSE GUIDELLI, EDER; ROCHA GONCALVES, ROGERIA. Phase-sensitive radioluminescence and photoluminescence features in Tm3+-doped yttrium tantalates for cyan and white light generation. DALTON TRANSACTIONS, v. 51, n. 29, p. 17-pg., 2022-06-24. (17/10423-7, 19/25991-6)

NUNES, L. R. R.; LABAKI, H. P.; CAIXETA, F. J.; GONCALVES, R. R.. Yb3+ influence on NIR emission from Pr3+-doped spherical yttria nanoparticles for advances in NIR I and NIR II biological windows. Journal of Luminescence, v. 241, JAN 2022. (20/05319-9, 19/25991-6, 17/10423-7)