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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
organization
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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
2007-08-10 15:33:07
date last changed
2017-08-13 04:16:59
@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},
  keyword      = {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},
  volume       = {537},
  year         = {2005},
}