Fluorescence of Fluorite and the Bivalent Europium Ion

  title={Fluorescence of Fluorite and the Bivalent Europium Ion},
  author={Karl b. Przibram},
EXPERIMENTS conducted in this Institute1 had led to the conclusion that the blue fluorescence of fluorite excited by filtered ultra-violet light is due to traces of europium under the influence of radioactive substances, and that a yellow-green fluorescence which some fluorites show at the temperature of liquid air—especially those from acid magmatic rocks—is, in the same way, due to ytterbium. As these rare earths are those most readily obtained in the bivalent form2, as further the reducing… 
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Color Centers and Luminescence in Single Crystals of Lanthanum Trichloride Containing Dipositive Europium
The edge of the fundamental absorption band in pure LaCl3 is at about 2250 A. There is no change in the absorption spectrum of pure LaCl3 in the range 2250 to 25 000 A on exposure at room temperature
The first example of fluorescence of the solid individual compounds of Eu2+ ion: EuCl2 , EuI2 , EuBr2.
Fluorescence (FL) from Eu2+ ion solid individual compounds was observed for the first time using the examples EuCl2 , EuI2 and EuBr2 . Fluorescence was detected at excitation by ultraviolet (UV)
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The concept of "aggregate science" is put forward to fill the gaps between molecules and aggregates and the structure-property relationships established for aggregates are expected to contribute to new materials and technological development.
Scandium, Yttrium und die Elemente der seltenen Erden. (Lanthan bis Cassiopeium.)
Die Elemente der seltenen Erden, die man auch als Lanthanide bezeichnet, nehmen unter den chemischen Grundstoffen eine Sonderstellung ein, die durch die auserordentlich nahe Verwandtschaft bedingt