Color centers in heavily irradiated CsI(Tl) crystals

V. Yakovlev, A. Meleshko, L. Trefilova

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The absorption and luminescence properties of CsI(Tl) crystals colored by irradiation are studied by the method of the time-resolved spectroscopy. The scheme of the electron transitions in CsI(Tl) crystal is suggested to explain the appearance of the color centers under exposure to the near-UV light. It is established that either of the two types activator color centers holds the charge carrier with opposite sign. The model of the hole Tl2+vc - activator color center is suggested. According to the model the positive charge of Tl2+ ion is compensated by the negative charge of a close cation vacancy vc -. The color center emission reveals in the cathode-luminescence spectrum of the colored CsI(Tl) crystal. The high-dose irradiation of CsI(Tl) crystal results in the reduction of the decay time of the near-thallium self-trapped excitons (STE) emission. The decay kinetics of Tl2+vc - emission contains the time components typical for the decay kinetics of near-thallium STE emission. The reason of the observed effects is the energy transfer from the near-thallium STE excitons to the color centers via the inductive-resonant mechanism.

Original languageEnglish
Pages (from-to)1447-1453
Number of pages7
JournalJournal of Luminescence
Volume128
Issue number9
DOIs
Publication statusPublished - Sep 2008

Fingerprint

Color centers
color centers
Color
Thallium
thallium
Crystals
excitons
crystals
Luminescence
decay
Irradiation
luminescence
Kinetics
irradiation
electron transitions
Energy Transfer
kinetics
Ultraviolet Rays
Electron transitions
Charge carriers

Keywords

  • Color center
  • Energy transfer
  • Luminescence
  • Thallium-doped cesium iodide

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Color centers in heavily irradiated CsI(Tl) crystals. / Yakovlev, V.; Meleshko, A.; Trefilova, L.

In: Journal of Luminescence, Vol. 128, No. 9, 09.2008, p. 1447-1453.

Research output: Contribution to journalArticle

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AB - The absorption and luminescence properties of CsI(Tl) crystals colored by irradiation are studied by the method of the time-resolved spectroscopy. The scheme of the electron transitions in CsI(Tl) crystal is suggested to explain the appearance of the color centers under exposure to the near-UV light. It is established that either of the two types activator color centers holds the charge carrier with opposite sign. The model of the hole Tl2+vc - activator color center is suggested. According to the model the positive charge of Tl2+ ion is compensated by the negative charge of a close cation vacancy vc -. The color center emission reveals in the cathode-luminescence spectrum of the colored CsI(Tl) crystal. The high-dose irradiation of CsI(Tl) crystal results in the reduction of the decay time of the near-thallium self-trapped excitons (STE) emission. The decay kinetics of Tl2+vc - emission contains the time components typical for the decay kinetics of near-thallium STE emission. The reason of the observed effects is the energy transfer from the near-thallium STE excitons to the color centers via the inductive-resonant mechanism.

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