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Emission decay kinetics in a CaWO4 : Bi crystal

Nagirnyi, V ; Kotlov, A ; Jönsson, Leif LU ; Kirm, M and Lushchik, A (2005) In Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment 537(1-2). p.61-65
Abstract
The decay kinetics of the 2.88 eV emission of pure and Bi-doped CaWO4 crystals has been studied in the temperature region of 4.2-300 K. The decay components connected with the radiative transitions from the triplet excited states of regular WO42- oxyanionic complexes and WO42- complexes perturbed by Bi3+ ions (WO42-(Bi3+) centres) have been identified. It is shown that WO4(Bi3+) centres can be excited directly above the edge of the fundamental absorption of CaWO4, or due to the energy transfer from the metastable state of a Bi3+ ion at the excitation in the Bi3+ absorption band at 4.4e.V. At temperatures T> 170 K, the excited state of the WO42-(Bi3+) centre is thermally ionised, giving rise to phosphorescence in the blue spectral... (More)
The decay kinetics of the 2.88 eV emission of pure and Bi-doped CaWO4 crystals has been studied in the temperature region of 4.2-300 K. The decay components connected with the radiative transitions from the triplet excited states of regular WO42- oxyanionic complexes and WO42- complexes perturbed by Bi3+ ions (WO42-(Bi3+) centres) have been identified. It is shown that WO4(Bi3+) centres can be excited directly above the edge of the fundamental absorption of CaWO4, or due to the energy transfer from the metastable state of a Bi3+ ion at the excitation in the Bi3+ absorption band at 4.4e.V. At temperatures T> 170 K, the excited state of the WO42-(Bi3+) centre is thermally ionised, giving rise to phosphorescence in the blue spectral region. These processes are compared with those known for excitons in PbWO4 crystals. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
emission decay kinetics, triplet states, CaWO4 : Bi, energy transfer
in
Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
volume
537
issue
1-2
pages
61 - 65
publisher
Elsevier
external identifiers
  • wos:000226737200013
  • scopus:11344249440
ISSN
0167-5087
DOI
10.1016/j.nima.2004.07.235
language
English
LU publication?
yes
id
e14821ed-4c34-4049-823d-9fc8aad1e78a (old id 254159)
date added to LUP
2016-04-01 15:48:56
date last changed
2023-01-04 19:18:57
@article{e14821ed-4c34-4049-823d-9fc8aad1e78a,
  abstract     = {{The decay kinetics of the 2.88 eV emission of pure and Bi-doped CaWO4 crystals has been studied in the temperature region of 4.2-300 K. The decay components connected with the radiative transitions from the triplet excited states of regular WO42- oxyanionic complexes and WO42- complexes perturbed by Bi3+ ions (WO42-(Bi3+) centres) have been identified. It is shown that WO4(Bi3+) centres can be excited directly above the edge of the fundamental absorption of CaWO4, or due to the energy transfer from the metastable state of a Bi3+ ion at the excitation in the Bi3+ absorption band at 4.4e.V. At temperatures T> 170 K, the excited state of the WO42-(Bi3+) centre is thermally ionised, giving rise to phosphorescence in the blue spectral region. These processes are compared with those known for excitons in PbWO4 crystals.}},
  author       = {{Nagirnyi, V and Kotlov, A and Jönsson, Leif and Kirm, M and Lushchik, A}},
  issn         = {{0167-5087}},
  keywords     = {{emission decay kinetics; triplet states; CaWO4 : Bi; energy transfer}},
  language     = {{eng}},
  number       = {{1-2}},
  pages        = {{61--65}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment}},
  title        = {{Emission decay kinetics in a CaWO4 : Bi crystal}},
  url          = {{http://dx.doi.org/10.1016/j.nima.2004.07.235}},
  doi          = {{10.1016/j.nima.2004.07.235}},
  volume       = {{537}},
  year         = {{2005}},
}