Optical excitation and emission spectra of Cs2NaErCl6

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Abstract
Optical excitation and emission spectra are reported for the Cs2NaErCl6 system under variable‐temperature (8.5–298 K) conditions. Detailed line assignments are made for the 4I15/2←4S3/2 and 4I15/2←4F9/2 high‐resolution emission spectra, and all five crystal‐field levels split out of the 4I15/2 ground multiplet are located. These results combined with our previously reported absorption results provide the locations of 35 crystal‐field levels spanning 11 multiplets of the Er3+ ion in Cs2NaErCl6. Energy level calculations based on a nine‐parameter 4f‐electron Hamiltonian operating within the 4f11 configuration of Er3+ give results in good agreement with experiment. Excitation spectra for 4I15/2←4S3/2 emission are reported at several temperatures over the 340–540 nm spectral region. Emission spectra excited by near‐ultraviolet radiation (centered at 383 nm) are reported over the 405–725 nm spectral region for sample temperatures ranging from 8.5 to 298 K. All but one of the seven multiplet‐to‐multiplet emission bands observed in this region decrease in intensity as the sample temperature is increased. The 4I13/2←4G11/2 emission exhibits an increase in intensity with increasing temperature.