Banca de DEFESA: DANIEL PRADO DA FONSECA
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : DANIEL PRADO DA FONSECA
DATE: 25/09/2026
TIME: 14:00
LOCAL: Auditório do PD
TITLE:
Influence of synthesis conditions on the structural and luminescent properties of Ca2SiO4 obtained by sol-gel combustion.
KEY WORDS:
Ca2SiO4; europium; luminescence; sol-gel combustion.
PAGES: 37
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:
Luminescent materials have attracted increasing scientific and technological interest due to their applications in optoelectronic devices, sensors, and energy conversion systems. Among host matrices, calcium silicates stand out for their high thermal and chemical stability, with beta-Ca2SiO4 being a promising candidate for rare-earth ion incorporation. In this work, the synthesis and structural and optical characterization of Eu3+-doped beta-Ca2SiO4 were investigated using a hybrid sol-gel combustion method. Samples with different dopant concentrations (0–1.0%) were prepared and subjected to thermal treatment in order to evaluate the influence of synthesis conditions on morphology, crystallinity, and luminescent performance. X-ray diffraction confirmed the predominant formation of the beta phase, while FTIR analyses evidenced the consolidation of the silicate network and the removal of residual nitrate species after thermal treatment. Emission spectra exhibited the characteristic Eu3+ transitions, with prominent red emission associated with the 5D0->7F2 transition, indicating effective dopant incorporation into the host lattice. The results demonstrate a strong correlation between synthesis method, structural organization, and luminescent efficiency, contributing to the development of silicate-based phosphors with potential technological applications.
COMMITTEE MEMBERS:
Presidente - 2264069 - HEVESON LUIS LIMA DE MATOS
Interno - 1582257 - JORGE LUIS OLIVEIRA SANTOS
Externo à Instituição - OSCAR MANOEL LOUREIRO MALTA
Externo à Instituição - ROMUALDO SANTOS SILVA JUNIOR