| Texto completo | |
| Autor(es): |
de Faria, Joao Vitor G.
;
Pontes, Lauany M.
;
Maia, Bruno B. P.
;
Magrin, Patricia P. A.
;
Silveira, Natalia Nascimento
;
dos Santos, Raquel A.
;
Rocha, Lucas A.
;
Nassar, Eduardo J.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Luminescence; v. 281, p. 10-pg., 2025-06-01. |
| Resumo | |
The properties of the gadolinium-aluminum-garnet (GAG) crystalline phase allow it to be applied in the medical and technological areas. GAG doping with Eu3+, Yb3+, and Er3+ ions intensifies its spectroscopic properties and paves the way for its use in photovoltaic cells, cancer treatment, and biosensors. In this study, Gd3Al5O12 matrixes doped with lanthanide ions were synthesized by the non-hydrolytic sol-gel route, characterized, and spectroscopically evaluated. For the synthesis, precursor aluminum (AlCl3) and lanthanide (GdCl3, EuCl3, YbCl3, and ErCl3) salts were employed at 5:3:1:1:10 or 10:3:1:1:10 Al3+/Gd3+/Eu3+/Er3+/Yb3+molar ratio. The resulting lanthanide-doped mixed oxide matrixes consisted of a mixture of GdAlO3 and Gd3Al5O12, and the Al3+/ Gd3+ molar ratio influenced phase formation. The effect of the Er3+/Yb3+ molar ratio (1:10, 1:5, or 1:1) on the spectroscopic properties of the matrixes was assessed. The excitation and emission spectra displayed the typical bands of Eu3+ ions. The bands were broadened, which indicated that Eu3+ occupied more than one crystallographic site. The emission spectra presented bands due to Gd3+ ions in the ultraviolet region. When energy upconversion was investigated under 980-nm laser, the bands typical of Er3+ ions emerged between 550 and 650 nm. Because the lanthanide-doped mixed oxide matrixes synthesized herein have potential application as biosensors, their cytotoxic effects on mammalian cells were tested. (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 |