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

A. F. García-Flores, J. S. Matias, D. J. Garcia, E. D. Martínez, P. S. Cornaglia, G. G. Lesseux, R. A. Ribeiro, R. R. Urbano, and C. Rettori
Phys. Rev. B 96, 165430 – Published 17 October 2017

Abstract

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 NaY1x[Er(Yb)]xF4 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 B20, B40, B60, and B66 CF parameters were considered in the Hamiltonian for RE ions located at the hexagonal C3h point symmetry site of the NaYF4 host lattice. These results allowed us to predict an overall CF splitting of 214 (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 NaY1x[Er(Yb)]xF4 hexagonal NPs was also compared with the most efficient up-conversion codoped NaY1xyErxYbyF4 hexagonal NPs.

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  • Received 8 September 2017

DOI:https://doi.org/10.1103/PhysRevB.96.165430

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. F. García-Flores1, J. S. Matias1, D. J. Garcia2, E. D. Martínez3, P. S. Cornaglia2, G. G. Lesseux3, R. A. Ribeiro1, R. R. Urbano3, and C. Rettori1,3

  • 1CCNH, Universidade Federal do ABC (UFABC), Santo André, São Paulo 09210-580, Brazil
  • 2Centro Atómico Bariloche, S.C. de Bariloche, CP8400 Río Negro, Argentina
  • 3Instituto de Física “Gleb Wataghin”, UNICAMP, Campinas, São Paulo 13083-970, Brazil

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Issue

Vol. 96, Iss. 16 — 15 October 2017

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