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1993 | 84 | 5 | 963-968
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Luminescence and Scintillation Properties of Ce_{x}La_{1-x}F_{3} Monocrystals

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In this communication we present our results concerning luminescence and scintillation properties of mixed cerium-lanthanum trifluoride monocrystals, Ce_{x}La_{1-x}F_{3}. The luminescence, luminescence excitation spectra and decays are complex, indicating the presence of Ce^{3+} ions in regular and parasitic "perturbed" sites. The efficient energy transfer from regular Ce^{3+} ions (emitting at 286 and 303 nm) to "perturbed" Ce^{3+} ions (emitting at 340 nm) and the lack of the fast energy migration between Ce^{3+} ions are responsible for non-exponential decays of the short-wavelength emission and a relatively long rise-time of the long-wavelength emission. The short-wavelength emission decays are described by the Inokuti-Hirayama model of statistically distributed donors and acceptors. Our estimates of oscillator strengths, at 13.1 × 10^{-3} for Ce^{3+}, and 13.5 × 10^{-3} for Ce^{3+}_{per}, confirm that the d-f transition on the Ce^{3+} ion in a different site must be responsible for the long-wavelength emission. Calculations of the Ce-Ce and Ce-Ce_{per} energy transfer rates give 7.7 × 10^{5} s^{-1} and 1.56 × 10^{9} s^{-1}. The concentration of "perturbers" in good CeF_{3} samples has been reduced down to about 0.11%. It is likely that the constant and significant progress made by crystal growers (Optovac Inc.) may eventually produce a superior material for applications in high energy and nuclear physics.
  • Institute of Physics, N. Copernicus University, Grudziądzka 5, 87-100 Toruń, Poland
  • Institute of Physics, N. Copernicus University, Grudziądzka 5, 87-100 Toruń, Poland
  • Department of Chemistry, Boston University, 590 Commonwealth Ave., Boston, MA 02215, USA
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