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 language | English |
|---|---|
| Pages (from-to) | 1447-1453 |
| Number of pages | 7 |
| Journal | Journal of Luminescence |
| Volume | 128 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 2008 |
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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 journal › Article
}
TY - JOUR
T1 - Color centers in heavily irradiated CsI(Tl) crystals
AU - Yakovlev, V.
AU - Meleshko, A.
AU - Trefilova, L.
PY - 2008/9
Y1 - 2008/9
N2 - 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.
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.
KW - Color center
KW - Energy transfer
KW - Luminescence
KW - Thallium-doped cesium iodide
UR - http://www.scopus.com/inward/record.url?scp=46549090153&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=46549090153&partnerID=8YFLogxK
U2 - 10.1016/j.jlumin.2008.01.020
DO - 10.1016/j.jlumin.2008.01.020
M3 - Article
AN - SCOPUS:46549090153
VL - 128
SP - 1447
EP - 1453
JO - Journal of Luminescence
JF - Journal of Luminescence
SN - 0022-2313
IS - 9
ER -