Er3+/Yb3+-Doped GdVO4 Obtained by the Non-Hydrolytic Sol-Gel Route and Potential Application as Up-Conversion Thermometer

AUTOR(ES)

Ferreira, Maria F.; Sousa, Kalil Z. R. de; Massarotto, Wagner L.; Ricci, Emiliane G.; Faria, Emerson H. de; Ciuffi, Katia J.; Sevic, Dragutin; Rocha, Lucas A.; Nassar, Eduardo J.

FONTE

J. Braz. Chem. Soc.

DATA DE PUBLICAÇÃO

2021-02

RESUMO

The properties of lanthanides allow them to be used as contrast agents for magnetic resonance imaging, thereby helping to differentiate between tissues, organs, and pathologies more efficiently. Lanthanides contain thermosensitive energy levels that aid identification of cancer and healthy cells. This work investigates the GdVO4 matrix obtained by the non-hydrolytic sol-gel methodology and doped with the lanthanide ions Er3+ and Yb3+ at a 1:1 molar ratio. The efficiency of the optical parameters was analyzed on the basis of the Er3+ green emission after excitation in the infrared region, namely 980 nm. The temperature-dependent fluorescence intensity ratio (FIR) between the thermally coupled Er3+ levels (2H11/2 and 4S3/2 → 4I15/2) was evaluated. The Er3+ emission depended on the laser power. The calculated number of photons was 2 in this case. Temperatures ranging from 298.3 to 374.5 K were assessed, and the sensitivity varied from 1.2 to 1.9% K-1, respectively. The initial temperature was estimated.

Documentos Relacionados

• Cr3+ Doped Al2O3 Obtained by Non-Hydrolytic Sol-Gel Methodology
• Synthesis and Characterization of Nb2O5:La3+,Eu3+ Phosphors Obtained by the Non-Hydrolytic Sol-Gel Process
• Characterization of the calcium-fluoroaluminosilicate glass prepared by a non-hydrolytic sol-gel route for future dental application as glass ionomer cement
• Synthesis and biocompatibility of an experimental glass ionomer cement prepared by a non-hydrolytic sol-gel method
• Cerium-doped SrHfO3 sol-gel films