Crystal-field effects in Er 3+ - And Yb 3+ -doped hexagonal NaYF4 nanoparticles

1. García-Flores, A.F.
2. Matias, J.S.
3. Garcia, D.J.
4. Martínez, E.D.
5. Cornaglia, P.S.
6. Lesseux, G.G.
7. Ribeiro, R.A.
8. Urbano, R.R.
9. Rettori, C.