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Luminescence and Scintillation Properties of Ce_{x}La_{1-x}F_{3} Monocrystals

100%

Wojtowicz A., Balcerzyk M., Lempicki A.

Acta Physica Polonica A

1993

vol. 84

issue 5

963-968

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.

Spectroscopy and Thermoluminescence of LuAlO_{3}:Ce

64%

Wiśniewski D., Drozdowski W., Wojtowicz A., Lempicki A., Dorenbos P., de Haas J., van Eijk C., Bos A.

Acta Physica Polonica A

1996

vol. 90

issue 2

377-384

The present status of the LuAlO_{3}:Ce scintillator is reviewed. Scintillation mechanism of this material is based on capture by Ce^{3+} of holes and then electrons from their respective bands. Results of spectroscopic and thermoluminescence experiments are presented to support this model.

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2 Acta Physica Polonica A

1 1996

1 1993

2 Lempicki A.

2 Wojtowicz A.

1 Balcerzyk M.

1 Bos A.

1 Dorenbos P.

1 Drozdowski W.

1 Wiśniewski D.

1 de Haas J.

1 van Eijk C.

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Luminescence and Scintillation Properties of Ce_{x}La_{1-x}F_{3} Monocrystals

Spectroscopy and Thermoluminescence of LuAlO_{3}:Ce