| Full text | |
| Author(s): |
Guidorzi, Maria Vitoria
;
Borges, Fernanda Hediger
;
da Costa, Ana Carla
;
Fu, Lianshe
;
Ferreira, Rute A. S.
;
Goncalves, Rogeria Rocha
Total Authors: 6
|
| Document type: | Journal article |
| Source: | Journal of Alloys and Compounds; v. 1010, p. 11-pg., 2024-12-31. |
| Abstract | |
This study reports the synthesis, structural, and spectroscopic characterization of Eu3+-doped yttrium stannate prepared by coprecipitation followed by thermal annealing at temperatures ranging from 700 to 1300 degrees C. All the samples contained pyrochlore Y2Sn2O7, and the crystallization degree increased with an increasing temperature. The Eu3+ emission spectra were used to follow the structural changes. For the sample annealed at 700 degrees C, inhomogeneous broadening resulted from Eu3+ distribution in a significantly disordered low-symmetry environment. As the annealing temperature increased, the spectral profile became sharper, and the band due to the 5 D 0 -> 7 F 1 transition stood out, revealing that Eu3+ occupied a centrosymmetric site (D3d). Site-selective excitation was observed through the 5 D 0 -> 7 F J (J = 0, 1, 2, 3, and 4) transitions under different excitation wavelengths. The samples exhibited potential for excitation in the green region (525 nm) and a long 5 D 0 excited state lifetime as the pyrochlore is stabilized. The outstanding results showed these materials have promising photonic applications, especially in imaging via time-resolved luminescence analysis. (AU) | |
| FAPESP's process: | 24/05947-0 - "Development of 2D Materials based on Sulfide and Tin Oxide Doped with Rare Earth Ions for Application in Heterogeneous Photocatalysis assisted by visible light" |
| Grantee: | Ana Carla da Costa |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 20/00277-6 - Development of nanoparticulate materials of lanthanide-doped rare earth tantalates for applications in Photonics |
| Grantee: | Fernanda Hediger Borges Ribeiro |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| 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: | 23/13509-0 - Development of rare earth tantalates doped with lanthanide ions for multimodal bioimaging and nanothermometry |
| Grantee: | Fernanda Hediger Borges Ribeiro |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 17/11301-2 - Rare earth doped micro and nanostructures luminescent materials: properties and applications |
| Grantee: | Rogéria Rocha Gonçalves |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 20/05319-9 - Multifunctional plataforms based on lanthanide doped nanostructured luminescent materials for potential photonic and theranostic applications |
| Grantee: | Rogéria Rocha Gonçalves |
| Support Opportunities: | Regular Research Grants |