Spectroscopic analysis of Nd3+ pairs in CsCdBr3

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Abstract
In Nd3+‐doped CsCdBr3 crystals, most of the Nd3+ ions form pairs. A detailed analysis of the optical spectroscopy of these pairs has been carried out using both absorption and luminescence spectra. Due to the low value of the Debye cutoff frequency for the phonons, many excited levels are luminescent, thus giving a lot of spectroscopic information and allowing the assignment of 65 levels to their associated irreducible representations. These results have been used to deduce, through a fitting procedure, the free‐ion and crystal‐field parameters. The results are discussed and compared with those found in other compounds.