Optical Properties of the Dy3+ Ion in Dyocl

A detailed analysis of the energy level scheme of the Dy3+ ion with the 4f9 electron configuration was carried out in the DyOCl matrix. The UV–vis-NIR absorption spectra of the tetragonal DyOCl were measured at selected temperatures between 9 and 300 K. The emission spectra of the Dy3+ ion in the LaOCl and GdOCl matrices were obtained at 77 K and room temperature. The experimental energy level scheme of 179 c.f. components representing 57 SLJ states was successfully simulated according to the C4v site symmetry by a phenomenological model using 14 free ion and five c.f. parameters with an RMS deviation of 21 cm−1. The results for DyOCl are consistent with those for other RE3+ ions in RE oxychloride hosts.