| Texto completo | |
| Autor(es): |
Garcia-Flores, A. F.
;
Matias, J. S.
;
Garcia, D. J.
;
Martinez, E. D.
;
Cornaglia, P. S.
;
Lesseux, G. G.
;
Ribeiro, R. A.
;
Urbano, R. R.
;
Rettori, C.
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW B; v. 96, n. 16, p. 7-pg., 2017-10-17. |
| Resumo | |
Since the up-conversion phenomenon in rare-earths (REs) doped NaYF4 is strongly affected by the crystal electric field (CF), determining the CF parameters, wave functions, and scheme of the energy levels of the RE J multiplets could be crucial to improve and tune the up-conversion efficiency. In this work, the temperature and magnetic field dependent magnetization of NaY1-x[Er(Yb)](x)F-4 hexagonal nanoparticles (NPs) is reported. The data were best fit using the appropriated CF Hamiltonian for the J = 15/2 (J = 7/2) ground state multiplet of Er3+ (Yb3+) ions. The B-2(0), B-4(0), B-6(0), and B-6(6) CF parameters were considered in the Hamiltonian for RE ions located at the hexagonal C-3h point symmetry site of the NaYF4 host lattice. These results allowed us to predict an overall CF splitting of similar to 214 (similar to 356 K) for Er3+ (Yb3+) and the wave functions and their energy levels for the J = 15/2 (J = 7/2) ground state multiplet which are in good agreement with the low temperature electron spin resonance experiments. Besides, our measurements allowed us to calculate all the excited CF J multiplets that yield to a good estimation of the up-conversion light emission linewidth. The nonlinear optical light emission of the studied NaY1-x[Er(Yb)](x)F-4 hexagonal NPs was also compared with the most efficient up-conversion codoped NaY1-x-yErxYbyF4 hexagonal NPs. (AU) | |
| Processo FAPESP: | 12/04870-7 - Estudos de novos materiais complexos e avançados |
| Beneficiário: | Pascoal Jose Giglio Pagliuso |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 15/23882-4 - Intensificaçao da eficiença plasmónica da upconversion em nanocristales dopados con terras rarass |
| Beneficiário: | Eduardo David Martínez |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 11/19924-2 - Estudo e desenvolvimento de novos materiais avançados: eletrônicos, magnéticos e nanoestruturados: uma abordagem interdisciplinar |
| Beneficiário: | Carlos Rettori |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 12/05903-6 - Ressonância magnética nuclear de novos materiais complexos e avançados em física da matéria condensada |
| Beneficiário: | Ricardo Rodrigues Urbano |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |