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Abstracts
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.
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
Year
Volume
Issue
Pages
963-968
Physical description
Dates
published
1993-11
Contributors
author
- Institute of Physics, N. Copernicus University, Grudziądzka 5, 87-100 Toruń, Poland
author
- Institute of Physics, N. Copernicus University, Grudziądzka 5, 87-100 Toruń, Poland
author
- Department of Chemistry, Boston University, 590 Commonwealth Ave., Boston, MA 02215, USA
References
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Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv84z519kz