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Time-resolved luminescence and excitation spectroscopy of Co-doped Gd3Ga3Al2O12 scintillating crystals

Pankratova, Viktorija ; Kozlova, Anna P. ; Buzanov, Oleg A. ; Chernenko, Kirill LU ; Shendrik, Roman ; Šarakovskis, Anatolijs and Pankratov, Vladimir (2020) In Scientific Reports 10(1).
Abstract

Cerium doped Gd3Ga3Al2O12 (GGAG) single crystals as well as GGAG:Ce single crystals co-doped by divalent (Mg2+, Ca2+) and tetravalent (Zr4+, Ti4+) ions have been studied by means of time-resolved luminescence as well as the excitation luminescence spectroscopy in vacuum ultraviolet (VUV) and soft X-ray (XUV) spectral range. Tunable laser excitation was applied for time-resolved experiments in order to obtain luminescence decay curves under excitations in Ce3+, Gd3+ and excitonic absorption bands. The influence of the co-dopant ions on the Ce3+ luminescence decay kinetics is elucidated. The fastest luminescence decay... (More)

Cerium doped Gd3Ga3Al2O12 (GGAG) single crystals as well as GGAG:Ce single crystals co-doped by divalent (Mg2+, Ca2+) and tetravalent (Zr4+, Ti4+) ions have been studied by means of time-resolved luminescence as well as the excitation luminescence spectroscopy in vacuum ultraviolet (VUV) and soft X-ray (XUV) spectral range. Tunable laser excitation was applied for time-resolved experiments in order to obtain luminescence decay curves under excitations in Ce3+, Gd3+ and excitonic absorption bands. The influence of the co-dopant ions on the Ce3+ luminescence decay kinetics is elucidated. The fastest luminescence decay was observed for the Mg2+ co-doped crystals under any excitation below bandgap energy indicating the perturbation of the 5d states of Ce3+ by Mg2+ ions. Synchrotron radiation was utilized for the luminescence excitation in the energy range from 4.5 to 800 eV. Special attention was paid to the analysis of Ce3+ excitation spectra in VUV and XUV spectral range where multiplication of electronic excitation (MEE) processes occur. Our results demonstrated that GGAG:Ce single crystals co-doped by Mg2+ ions as well as the GGAG:Ce crystal annealed in vacuum reveal the most efficient excitation of Ce3+ emission in VUV-XUV excitation range. The role of intrinsic defects in MEE processes in the co-doped as well as in the annealed GGAG:Ce single crystals is discussed.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
10
issue
1
article number
20388
publisher
Nature Publishing Group
external identifiers
  • scopus:85096443290
  • pmid:33230216
ISSN
2045-2322
DOI
10.1038/s41598-020-77451-x
language
English
LU publication?
yes
id
c2abf7f0-ad8d-4eb7-ac2c-abe6dba28717
date added to LUP
2020-11-30 13:03:55
date last changed
2024-06-28 05:06:48
@article{c2abf7f0-ad8d-4eb7-ac2c-abe6dba28717,
  abstract     = {{<p>Cerium doped Gd<sub>3</sub>Ga<sub>3</sub>Al<sub>2</sub>O<sub>12</sub> (GGAG) single crystals as well as GGAG:Ce single crystals co-doped by divalent (Mg<sup>2+</sup>, Ca<sup>2+</sup>) and tetravalent (Zr<sup>4+</sup>, Ti<sup>4+</sup>) ions have been studied by means of time-resolved luminescence as well as the excitation luminescence spectroscopy in vacuum ultraviolet (VUV) and soft X-ray (XUV) spectral range. Tunable laser excitation was applied for time-resolved experiments in order to obtain luminescence decay curves under excitations in Ce<sup>3+</sup>, Gd<sup>3+</sup> and excitonic absorption bands. The influence of the co-dopant ions on the Ce<sup>3+</sup> luminescence decay kinetics is elucidated. The fastest luminescence decay was observed for the Mg<sup>2+</sup> co-doped crystals under any excitation below bandgap energy indicating the perturbation of the 5d states of Ce<sup>3+</sup> by Mg<sup>2+</sup> ions. Synchrotron radiation was utilized for the luminescence excitation in the energy range from 4.5 to 800 eV. Special attention was paid to the analysis of Ce<sup>3+</sup> excitation spectra in VUV and XUV spectral range where multiplication of electronic excitation (MEE) processes occur. Our results demonstrated that GGAG:Ce single crystals co-doped by Mg<sup>2+</sup> ions as well as the GGAG:Ce crystal annealed in vacuum reveal the most efficient excitation of Ce<sup>3+</sup> emission in VUV-XUV excitation range. The role of intrinsic defects in MEE processes in the co-doped as well as in the annealed GGAG:Ce single crystals is discussed.</p>}},
  author       = {{Pankratova, Viktorija and Kozlova, Anna P. and Buzanov, Oleg A. and Chernenko, Kirill and Shendrik, Roman and Šarakovskis, Anatolijs and Pankratov, Vladimir}},
  issn         = {{2045-2322}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Scientific Reports}},
  title        = {{Time-resolved luminescence and excitation spectroscopy of Co-doped Gd<sub>3</sub>Ga<sub>3</sub>Al<sub>2</sub>O<sub>12</sub> scintillating crystals}},
  url          = {{http://dx.doi.org/10.1038/s41598-020-77451-x}},
  doi          = {{10.1038/s41598-020-77451-x}},
  volume       = {{10}},
  year         = {{2020}},
}