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Leif Jönsson

Leif Jönsson

Professor emeritus

Leif Jönsson

Emission decay kinetics in a CaWO4 : Bi crystal

Author

  • V Nagirnyi
  • A Kotlov
  • Leif Jönsson
  • M Kirm
  • A Lushchik

Summary, in English

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.

Department/s

  • Particle and nuclear physics

Publishing year

2005

Language

English

Pages

61-65

Publication/Series

Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment

Volume

537

Issue

1-2

Document type

Journal article

Publisher

Elsevier

Topic

  • Accelerator Physics and Instrumentation

Keywords

  • emission decay kinetics
  • triplet states
  • CaWO4 : Bi
  • energy transfer

Status

Published

ISBN/ISSN/Other

  • ISSN: 0167-5087