Mechanism of photo-stimulated luminescence in copper and Europium doped alkali halide phosphors

Pradip Bandyopadhyay, M. T. Jose, U. Madhusoodanan, B. S. Panigrahi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The mechanism of Photo-stimulated Luminescence (PSL) is investigated in copper and europium doped KCl. Electron Paramagnetic Resonance, Photoluminescence, and X-ray Photoelectron Spectroscopy measurements were performed on powdered samples of KCl:Cu+ and KCl:Eu2+, γ-irradiated at room temperature. Our results show that the charge state conversion of Cu+ to Cu2+ does not take place after γ-irradiation in KCl:Cu, and that the observed PSL does not involve Cu2+-F recombination. In KCl:Eu2+, even though a significant reduction in Eu2+ concentration is detected after γ-irradiation, the PSL is not due to Eu3+-F recombination. The energy transfer from the recombination process involving F centers to the activator ions Cu+ and Eu2+ in KCl seems to cause the PSL in these materials.

Original languageEnglish (US)
Pages (from-to)45-50
Number of pages6
JournalRadiation Effects and Defects in Solids
Volume149
Issue number1 -4 pt 1
StatePublished - 1999

Fingerprint

Europium
Alkali halides
europium
alkali halides
Phosphors
phosphors
Luminescence
Copper
luminescence
copper
Irradiation
irradiation
color centers
Energy transfer
Paramagnetic resonance
electron paramagnetic resonance
Photoluminescence
X ray photoelectron spectroscopy
energy transfer
photoelectron spectroscopy

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Radiation

Cite this

Bandyopadhyay, Pradip ; Jose, M. T. ; Madhusoodanan, U. ; Panigrahi, B. S. / Mechanism of photo-stimulated luminescence in copper and Europium doped alkali halide phosphors. In: Radiation Effects and Defects in Solids. 1999 ; Vol. 149, No. 1 -4 pt 1. pp. 45-50.
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Mechanism of photo-stimulated luminescence in copper and Europium doped alkali halide phosphors. / Bandyopadhyay, Pradip; Jose, M. T.; Madhusoodanan, U.; Panigrahi, B. S.

In: Radiation Effects and Defects in Solids, Vol. 149, No. 1 -4 pt 1, 1999, p. 45-50.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mechanism of photo-stimulated luminescence in copper and Europium doped alkali halide phosphors

AU - Bandyopadhyay, Pradip

AU - Jose, M. T.

AU - Madhusoodanan, U.

AU - Panigrahi, B. S.

PY - 1999

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N2 - The mechanism of Photo-stimulated Luminescence (PSL) is investigated in copper and europium doped KCl. Electron Paramagnetic Resonance, Photoluminescence, and X-ray Photoelectron Spectroscopy measurements were performed on powdered samples of KCl:Cu+ and KCl:Eu2+, γ-irradiated at room temperature. Our results show that the charge state conversion of Cu+ to Cu2+ does not take place after γ-irradiation in KCl:Cu, and that the observed PSL does not involve Cu2+-F recombination. In KCl:Eu2+, even though a significant reduction in Eu2+ concentration is detected after γ-irradiation, the PSL is not due to Eu3+-F recombination. The energy transfer from the recombination process involving F centers to the activator ions Cu+ and Eu2+ in KCl seems to cause the PSL in these materials.

AB - The mechanism of Photo-stimulated Luminescence (PSL) is investigated in copper and europium doped KCl. Electron Paramagnetic Resonance, Photoluminescence, and X-ray Photoelectron Spectroscopy measurements were performed on powdered samples of KCl:Cu+ and KCl:Eu2+, γ-irradiated at room temperature. Our results show that the charge state conversion of Cu+ to Cu2+ does not take place after γ-irradiation in KCl:Cu, and that the observed PSL does not involve Cu2+-F recombination. In KCl:Eu2+, even though a significant reduction in Eu2+ concentration is detected after γ-irradiation, the PSL is not due to Eu3+-F recombination. The energy transfer from the recombination process involving F centers to the activator ions Cu+ and Eu2+ in KCl seems to cause the PSL in these materials.

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