Wydział Chemii

Mirosław Karbowiak

Czesław Rudowicz

2018

Journal of Luminescence

199

116-125

10.1016/j.jlumin.2018.03.007

Naukowa

Angielski

Artykuł

Synthesis and characterization of systems containing divalent lanthanide elements (Ln²⁺) is still largely an unexplored area. Until recently the absorption spectra were obtained nearly exclusively for Ln²⁺:CaF₂ crystals, whereas most studied ions are Sm²⁺, Eu²⁺, Tm²⁺ and Yb²⁺. The scarcity of data on spectral properties of Ln²⁺ ions and usage of different methodologies for their analysis hinders uncovering systematic changes in Hamiltonian parameters and thus inherent trends across the Ln series. Here we report the first calculations of the crystal-field (CF) energy levels for the 4f³5d¹ configuration of Nd²⁺ ion. The novel absorption spectra for Nd²⁺ and Dy²⁺ ions in SrCl₂ as well as new spectra for Sm²⁺, Eu²⁺, Tm²⁺, and Yb²⁺ ions in SrCl₂ obtained independently by us are analyzed using uniform methodology proposed here. Our data are supplemented by comprehensive reanalysis of available spectral data for Sm²⁺, Eu²⁺, Tm²⁺, and Yb²⁺ ions in SrCl₂. This approach yields refined and more consistent sets of Hamiltonian parameters. Systematic analysis of free-ion parameters and CF parameters for the six Ln²⁺ ions in SrCl₂ studied by us provides sufficiently large amount of data that allows to reveal inherent trends across the Ln series. Our results enable for the first time to check if identified trends would be sufficiently systematic to allow for predicting the spectrum for any lanthanide ion based on the sets of parameters derived from the spectra obtained for another ion in the same matrix.

Rare earth alloys and compounds, Optical absorption spectroscopy, Crystal and ligand fields, Divalent lanthanides, divalent neodymium

https://doi.org/10.1016/j.jlumin.2018.03.007

http://www.elsevier.com