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In this communication we present our results concerning luminescence and scintillation properties of mixed cerium-lanthanum trifluoride monocrystals, CexLa1-xF3. The luminescence, luminescence excitation spectra and decays are complex, indicating the presence of Ce3+ ions in regular and parasitic "perturbed" sites. The efficient energy transfer from regular Ce3+ ions (emitting at 286 and 303 nm) to "perturbed" Ce3+ ions (emitting at 340 nm) and the lack of the fast energy migration between Ce3+ 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 x 10(-3) for Ce3+, and 13.5 x 10(-3) for Ce-per(3+), confirm that the d-f transition on the Ce3+ 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 x 10(5) s(-1) and 1.56 x 10(9) s(-1). The concentration of "perturbers" in good CeF3 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.

Luminescence and Scintillation Properties of CexLa1-xF3Monocrystals

Luminescence and Scintillation Properties of Ce_xLa_1-xF₃Monocrystals