VUV spectroscopy of Ce$^{3+}$-doped Na$_{0.4}$Lu$_{0.6}$F$_{2.2}$ single crystals

The short-wave transmission spectrum of Na$_{0.4}$Lu$_{0.6}$F$_{2.2}$ with the visible/ultraviolet transmission edge of 8 eV was studied. Absorption spectra of the 4f—5d transitions of the Ce$^{3+}$ ion in the region of 4–8 eV were studied in Ce$^{3+}$-doped Na$_{0.4}$Lu$_{0.6}$F$_{2.2}$ single crystals. Luminescence spectra in the ultraviolet and visible spectral regions, luminescence decay kinetics and reflection and luminescence excitation spectra in the visible/ultraviolet and ultraviolet regions (4–20 eV) were investigated at helium and room temperatures.