Emission decay kinetics in a CaWO4 : Bi crystal
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/254159
- author
- Nagirnyi, V ; Kotlov, A ; Jönsson, Leif LU ; Kirm, M and Lushchik, A
- organization
- publishing date
- 2005
- 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}}, }