Autor(es)

Ferreira, Maria Fernanda ; de Faria, Joao Vitor Goncalves ; Pontes, Lauany Mazzon ; Crespi, Marcela Guedes Matos ; Rocha, Lucas Alonso ; Nassar, Eduardo Jose

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 135, n. 10, p. 8-pg., 2024-03-14.

Resumo

In this study, we used the non-hydrolytic sol-gel methodology to synthesize gadolinium vanadate particles doped with different Er3+ and Yb3+ molar ratios. Er3+ and Yb3+ chlorides and vanadium alkoxide were used as precursors during the sol-gel synthesis. The resulting powders were treated at 800( degrees)C and characterized by x-ray diffraction and photoluminescence. The x-ray diffractogram displayed peaks attributed to the gadolinium vanadate matrix. Photoluminescence helped to evaluate the Fluorescence Intensity Ratio (FIR), which is important for understanding the nanothermometer property. The FIR of the GdVO4:Er3+/Yb3+ samples containing different Er3+ and Yb3+ molar ratios increased as a function of the laser power, which indicated that the local temperature increased. The excitation spectra obtained at fixed wavelengths of 525 and 555 nm displayed bands at 322, 379, and 489 nm, ascribed to the charge transfer band and Er3+ levels. Upon excitation at 321 nm, the emission spectra in the visible region presented intense bands at 525 and 555 nm, due to Er3+ emission, and excitation at 321 nm led to emission in the infrared region, 980 and 1550 nm. In conclusion, the synthesized system can be employed as a temperature sensor. (AU)

• Processo FAPESP: 19/26439-5 - Nanopartículas obtidas via sol-gel contendo íons lantanídeos para aplicação multimodal em Medicina
• Beneficiário: Eduardo José Nassar
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/12981-0 - ESTUDO DA CONVERSÃO ASCENDENTE DE ENERGIA NA MATRIZ GdVO4 DOPADA COM Er3+ / Yb3+
• Beneficiário: Maria Fernanda Ferreira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 15/20298-0 - Obtenção de matrizes luminescentes de LaNbO4:Ln (Ln = Dy, TM, er e Yb) pelo processo de pirólise de aerossol
• Beneficiário: Lucas Alonso Rocha
• Modalidade de apoio: Auxílio à Pesquisa - Regular