Optical characterization and electronic energy-level structure of Er3+-doped CsCdBr3

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Abstract
Information obtained from optical absorption, excitation, and emission experiments on erbiumdoped crystalline CsCdBr3 is analyzed, using a semiempirical Hamiltonian, to calculate atomic and crystal‐field interaction parameters and electronic state wave functions. A majority of the Er3+ ions substitute at a Cd2+ site giving C 3v point group symmetry and forming an Er3+ ion dimer center. This dimerization, together with the material’s low phonon energies, and the specific positioning of states in the Er3+ (4f 11) configuration, produce the interesting and useful emission properties of the material. Comparisons are made with other erbium halide crystals, and interaction parameter and energy‐level results for Nd3+:CsCdBr3 are also presented. The inclusion of second order correlation crystal‐field interaction parameters is shown to be essential for accurately characterizing splittings of several J multiplets important in visible emission pathways.