Energy levels of lanthanide ions in the cubic Cs2NaLnCl6 and Cs2NaYCl6:Ln3+ (doped) systems

Abstract

The best available energy level data for the cubic Cs₂NaLnCl₆ and Cs₂NaYCl₆:Ln³⁺ (doped) systems are collected together and summarized. These data are analyzed in terms of a parametric model which assumes an octahedral (O_h) site symmetry for the Ln³⁺ ions and a 4 f^N ‘‘free‐ion’’ Hamiltonian similar to that used previously in energy level analyses of the LaCl₃:Ln³⁺ systems. The empirical energy level data are fit to the parametrized 4 f^N Hamiltonian, and the resulting ‘‘best‐fit’’ parameter sets and calculated energy levels are presented and discussed.