Abstract:
The results of investigations into the optical properties of color centers formed under X-ray irradiation in nominally pure KY$_3$F$_{10}$ crystals and those doped with Ce$^{3+}$ ions are presented. The types of color centers and their characteristic evolution time constants have been determined. The influence of Ce$^{3+}$ ion doping on the evolution of color centers has been examined. A comparison of the parameters of color centers in the doped and nominally pure crystals is provided. X-ray induced color centers in the nominally pure crystal have been identified as F- and F$_2$-type centers, whereas in the doped crystal, F-, F$_2$-, and F$_A$-type centers are observed. In KY$_3$F$_{10}$ crystals doped with Ce$^{3+}$ ions, the recombination times of free charge carriers associated with F-type color centers differ significantly from the recombination times of charges associated with these types of color centers in the nominally pure crystal. In the doped crystal (in comparison to the nominally pure one), the maxima of the absorption bands are shifted towards the shorter wavelength region.
Keywords:KY$_3$F$_{10}$, Ce, color centers, types of color centers, optical transmission spectra, energy state diagram.
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