Emission decay kinetics in a CaWO4 : Bi crystal

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

doi:10.1016/j.nima.2004.07.235

Emission decay kinetics in a CaWO4 : Bi crystal

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

Particle and nuclear physics

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	61-65
Journal	Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
Volume	537
Issue number	1-2
DOIs	https://doi.org/10.1016/j.nima.2004.07.235
Publication status	Published - 2005

Subject classification (UKÄ)

Subatomic Physics

Free keywords

emission decay kinetics
triplet states
CaWO4 : Bi
energy transfer

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10.1016/j.nima.2004.07.235

Cite this

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title = "Emission decay kinetics in a CaWO4 : Bi crystal",

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.",

keywords = "emission decay kinetics, triplet states, CaWO4 : Bi, energy transfer",

author = "V Nagirnyi and A Kotlov and Leif J{\"o}nsson and M Kirm and A Lushchik",

year = "2005",

doi = "10.1016/j.nima.2004.07.235",

language = "English",

volume = "537",

pages = "61--65",

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

issn = "0167-5087",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - Emission decay kinetics in a CaWO4 : Bi crystal

AU - Nagirnyi, V

AU - Kotlov, A

AU - Jönsson, Leif

AU - Kirm, M

AU - Lushchik, A

PY - 2005

Y1 - 2005

N2 - 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.

AB - 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.

KW - emission decay kinetics

KW - triplet states

KW - CaWO4 : Bi

KW - energy transfer

U2 - 10.1016/j.nima.2004.07.235

DO - 10.1016/j.nima.2004.07.235

M3 - Article

SN - 0167-5087

VL - 537

SP - 61

EP - 65

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

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

IS - 1-2

ER -

Emission decay kinetics in a CaWO4 : Bi crystal

Abstract

Subject classification (UKÄ)

Free keywords

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