Spectroscopy of Trivalent Praseodymium in Barium Yttrium Fluoride
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This work reports the results of an investigation of the spectroscopic properties of trivalent praseodymium (Pr3+) in barium yttrium fluoride (BaY2F8). Two doping concentrations were used: BaY2F8:Pr3+ (0.3%) and BaY2F8:Pr3+ (1%). Absorption spectra, taken at 77 and 300 K, allowed the placement of the energy levels of the 4f2 electronic configuration of Pr3+. Luminescence spectra were obtained with transitions originating mainly in the metastable levels 3P0, 1D2, and 3F3. Time-resolved spectroscopy was used to clarify the assignment of several spectral lines.
The lifetimes of both 3P0 and 1D2 were found to be essentially independent of concentration and temperature with values of 55 and ∼250 μs respectively, in the temperature range 77 to 500 K. In the same temperature range, the lifetime of the 3F3 level was found to vary from 23 ms at 77 K to 5 ms at 500 K. The effects of temperature on the widths and positions of several spectral lines originating in the 3P0 and 1D2 levels were studied. The mechanism of Raman scattering of phonons fitted the observed results with an effective Debye temperature of 500 K.
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