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Distribution of Pb^{2+} Ions in PbF_{2}-Doped CaF_{2} Crystals

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Paraschiva M., Nicoara I., Stef M., Bunoiu O.
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issue 3
466-470
EN
Calcium fluoride crystals doped with various concentrations of PbF_{2} have been grown using the Bridgman technique. The optical absorption spectra reveal the characteristic UV absorption bands of the Pb^{2+} ions. The distribution of the Pb^{2+}-ions along four crystals has been investigated using the optical absorption method. Taking into account the relationship between the optical absorption coefficient and the concentration of the impurities in the samples, the effective segregation coefficient of the Pb^{2+} ions has been calculated. Our study shows that the effective segregation coefficient of the Pb^{2+} ions in CaF_{2} host depends on the dopant concentration, and varies between 0.85 and 1.15, for 0.5 mol%PbF_{2} and 3 mol%PbF_{2}-doped CaF_{2}, respectively.
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Influence of Various Impurities on the Optical Properties of YbF_3-Doped CaF_2 Crystals

100%
Stef M., Pruna A., Pecingina-Garjoaba N., Nicoara I.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
1007-1012
EN
Calcium fluoride crystals doped with YbF_3 and co-doped with LiF and NaF were grown using the vertical Bridgman method. Several of rare-earth ions (such as Eu, Sm, Ho, Tm, and Yb) can be stabilized in the divalent state in the CaF_2. The change of valence was attained by various methods. The optical absorption spectra reveal the characteristic absorption bands of the Yb^{3+} and Yb^{2+} ions. This means that the developed crystal growth process achieves a good Yb^{3+} to Yb^{2+} conversion in the as-grown crystals. The influence of other impurities, such as Na^+ or Li^+, on the absorption and emission spectrum of YbF_3-doped CaF_2 was studied. The Li^+ and Na^+ ions drastically decrease the absorption coefficient of the Yb^{2+} ions in the UV band and the emission intensity by excitation in 230 nm.
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