Fluorine alkaline earth (MgF2, CaF2, SrF2, BaF2) influence on thermal, structural, and luminescent properties of Eu3+-doped niobium phospho-fluoride glass

Author(s)

da Silva, Leandro Olivetti Estevam ; Rivera, V. A. G. ; Falci, Rodrigo ; Messaddeq, Younes ; de Oliveira Junior, Marcos ; Manzania, Danilo

• Document type: Journal article
• Source: Materials Research Bulletin; v. 185, p. 12-pg., 2025-01-11.

Abstract

New rare earth-doped glasses with wide transparency and tunable optical properties show promise for various technological applications. While the effects of alkaline earth metals on glass compositions have been widely studied, their role in niobium-phosphate glasses remains unexplored. This study investigates Eu3+-doped niobium-lead pyrophosphate glasses modified with different alkaline earth metals, prepared via melt-quenching. Thermal, structural, optical, and spectroscopic properties were examined. Differential scanning calorimetry (DSC) showed that the thermal stability against crystallization decreased from Mg2+ to Ba2+, with Sr2+ exhibiting the lowest stability. Raman and solid-state NMR spectroscopy revealed minimal changes in the niobium- phosphate network but shifts in the Q0/Q1 phosphate unit ratio were detected. Spectroscopic analysis showed that larger alkaline earth ions increase symmetry around Eu3+ and increase the 5 D 0 lifetime. Sr2+-containing samples showed exceptional results, suggesting a possible substitution between Sr2+ and Pb2+ due to their similar ionic radii. (AU)

• FAPESP's process: 22/01762-0 - Influence of earth-alkali fluorides (MgF2, CaF2, SrF2, BaF2) and Nb2O5 on the structural and optical properties of fluorophosphoniobate glasses
• Grantee: Leandro Olivetti Estevam da Silva
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 21/08111-2 - Development of rare earth based light converters: luminescent markers, optical sensors, and amplifiers
• Grantee: Hermi Felinto de Brito
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 23/05994-6 - Energy conversion involving lanthanide ions in oxyfluoride glasses and glass-ceramics: From fundamentals to luminescence and thermometric properties
• Grantee: Danilo Manzani
• Support Opportunities: Regular Research Grants
• FAPESP's process: 22/02974-1 - Fundamental aspects of the amorphous state of metal organic compounds: a solid state magnetic resonance approach
• Grantee: Marcos de Oliveira Junior
• Support Opportunities: Research Grants - Initial Project
• FAPESP's process: 19/16115-8 - Study of the optical and luminescent properties of earth-alkali (MgF2, CaF2, SrF2, BaF2) Fluorophosphate glass and glass-ceramic doped with lanthanide ions
• Grantee: Leandro Olivetti Estevam da Silva
• Support Opportunities: Scholarships in Brazil - Scientific Initiation