Spectroscopic and structural study of fluorophosphoniobate glasses and glass-ceramics containing alkaline earth metals doped with Eu3+ and codoped with Yb3+/Tm3+

• Grant number: 23/09794-1
• Support Opportunities: Scholarships abroad - Research Internship - Master's degree
• Start date: September 25, 2023
• End date: December 04, 2023
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Danilo Manzani
• Grantee: Leandro Olivetti Estevam da Silva
• Supervisor: Laeticia Petit
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Institution abroad: Tampere University, Finland
• Associated to the scholarship: 22/01762-0 - Influence of earth-alkali fluorides (MgF2, CaF2, SrF2, BaF2) and Nb2O5 on the structural and optical properties of fluorophosphoniobate glasses, BP.MS

Abstract

The proposed research project for the research exchange program abroad encompasses advanced structural and spectroscopic exploration of both the glass materials already synthesized in the ongoing study under the scholarship in the home country, with molar compositions of 80-yNaPO3-20XF¬2-yNb2O5 and 99,5[80-yNaPO3-20XF¬2-yNb2O5]:0,5%Eu2O3, and the newly proposed glass matrix codoped with the rare earth ion pair Yb3+ and Tm3+, with a composition of 98,9[80-yNaPO3-20XF¬2-yNb2O5]:1,0%Yb2O3-0,1%Tm2O3 (X = Mg, Ca, Sr, and Ba, y = 5, 10, 15, and 20%), as well as the corresponding glass ceramics synthesized from these glasses. The advanced structural and spectroscopic characterization of these glass and glass ceramic materials aims to explore a novel matrix with high potential for applications in the field of photonics. The objective is to correlate how different alkaline earth metals, different concentrations of Nb2O5, and the precipitation of different crystalline phases within the glass structures influence the materials' structure and spectroscopic properties. The optical and structural probe ion Eu3+ will be utilized to evaluate the local environment surrounding the ion (through the intensity ratio R between the emission lines 5D0’7F2/5D0’7F1 and the intensity parameters ©», » = 2, 4, 6). The Yb3+/Tm3+ ion pair will be employed to assess the structure-property relationship between compositional and structural changes in the matrices and the energy transfer process via upconversion. The aim is to gain a deeper understanding of the correlation between composition, structure, and spectroscopic properties in these glass and glass ceramic materials, with the potential to provide valuable insights into their application in photonics. (AU)