VUV and UV fluorescence and absorption studies of Pr^3+-doped LiLuF_4 single crystals

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Abstract
The laser-induced fluorescence spectrum of LiLuF4:Pr3+ single crystals, pumped by an F2 pulsed-discharge molecular laser at 157 nm, was obtained in the VUV and UV regions of the spectrum at room temperature. A number of new fluorescence peaks were observed for the first time to our knowledge. They were assigned to the dipole-allowed transitions 4f5d → 4f2 of Pr3+ ion. In addition, the absorption spectrum of the crystal samples was recorded. The positions of the bands with the 4f5d configuration were found to be 46 412, 53 267, and 63 397 cm−1 from the ground state, 3H4, of the Pr3+ ion. The edge (onset) of the 4f5d bands was at 45 100 cm−1.