Journal of Physical Studies 5(2), 162–169 (2001) DOI: https://doi.org/10.30970/jps.05.162 LUMINESCENCE PROPERTIES OF THE IMPURITY SAMARIUM IONS IN THE CADMIUM TUNGSTATE SINGLE CRYSTALS M. U. Bilyi1, S. G. Nedilko1, O. V. Chukova1, L. M. Limarenko2, Z. T. Moroz2, M. V. Pashkovskyi2 1Taras Shevchenko Kyiv National University, Physics Faculty 6 Acad. Hlushkov Ave., Kyiv, UA-03680, Ukraine 2Ivan Franko National University of Lviv, Physics Faculty 8 Kyrylo i Mefodii Str., Lviv, UA-79005, Ukraine

Cadmium tungstate single crystals doped with threevalent samarium ions (CdWO$_{4}-$Sm$^{3+}$) were grown by Czochralski method. Impurity concentrations were $5\times 10^{-2}$ and $2.5\times 10^{-1}$ mass \%. X-rays diffraction analysis have shown that impurity concentrations in the grown samples are decreased by about three orders. Luminescence spectra of the investigated crystals contain wide non-structural spectral bands caused by the CdWO$_4$ matrix emission. The narrow lines caused by the electron transitions in the inner shell of the Sm$^{3+}$ ions were observed against the background of matrix emission. Using luminescence, absorption and excitation spectra we have analyzed the manifestation of interaction between the crystal matrix and the impurity ion. The obtained results allow us to draw the conclusion about the formation of two types of samarium ion centers in a cadmium tungstate crystal lattice.

PACS number(s): 78.55.Hx

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