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

• Authors: A. Wojtowicz , M. Balcerzyk , A. Lempicki
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

78.90.+t; 78.55.-m; 61.80.Ed; 29.40.-n

Discipline

• 78.55.-m: Photoluminescence, properties and materials(for time resolved luminescence, see 78.47.jd)
• 61.80.Ed: γ-ray effects
• 29.40.-n: Radiation detectors(for mass spectrometers, see 07.75.+h; see also 95.55.Vj Neutrino, muon, pion, and other particle detectors; cosmic ray detectors in astronomy)
• 78.90.+t: Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter (restricted to new topics in section 78)

• Journal: Acta Physica Polonica A
• Year: 1993
• Volume: 84
• Issue: 5
• Pages: 963-968

Dates

published

1993-11

Contributors

author

A. Wojtowicz

• Institute of Physics, N. Copernicus University, Grudziądzka 5, 87-100 Toruń, Poland

author

M. Balcerzyk

• Institute of Physics, N. Copernicus University, Grudziądzka 5, 87-100 Toruń, Poland

author

A. Lempicki

• Department of Chemistry, Boston University, 590 Commonwealth Ave., Boston, MA 02215, USA

Identifiers

DOI

10.12693/APhysPolA.84.963