Crystal-field effects in Er3+- and Yb3+-doped hexagonal NaYF4 nanoparticles

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.

• 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)

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