. The donor fluorescence decay was not fit by the law t 0.5 and the quenching efficiency was characterized by the square-law dependence on the concentration and a very poor dependency on the temperature. The analysis of some models allows us to assume, that in this case the cooperative quenching of the 1 D 2 states of both type Pr 3+ optical centers can take place.
The quasi-symmetry of the inequivalent cation sites in the crystals Gd2SiO5, Y2SiO5, and Lu2SiO5 is established on the basis of an analysis of the features of the low-temperature optical spectra of the impurity ion Pr3+. One type of cation site of the crystals Y2SiO5 and Lu2SiO5 manifests the quasi-symmetry of a distorted octahedron, and the other type, that of a distorted tetrahedron. The parameters characterizing the energy spectrum of the free Pr3+ ion in the crystalline field of the cation sites are determined.
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