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Recombination luminescence of CaSO4:Tb3+ and CaSO4:Gd3+phosphors

100%
Kudryavtseva I., Lushchik A., Maaroos A., Azmaganbetova Z., Nurakhmetov T., Salikhoja Z.
Open Physics
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2012
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vol. 10
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issue 4
995-1001
EN
A comparative study of the excitation of luminescence by VUV radiation as well as of thermally and photostimulated luminescence has been carried out for CaSO4:Tb3+ and CaSO4:Gd3+ phosphors, where Na+ or F− ions are used for charge compensation. The distinction in hole processes for the phosphors with Na+ or F− compensators is determined by the differing thermal stability of the holes localized at/near Tb3+Na+ and Gd3+Na+ (up to 100–160 K) or at/near Tb3+F− V Ca and Gd3+F− V Ca centers involving also a cation vacancy (up to 400–550 K). Tunnel luminescence in the pairs of localized electrons and holes nearby Tb3+ or Gd3+ has been detected. The mechanisms of electron-hole, hole-electron and tunnel recombination luminescence as well as a subsequent released energy transfer to RE3+ ions are considered.
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The effects of mineralogical changes that occurin artificial aggregates

75%
Adamczyk Z., Grygierek M., Łupieżowiec M., Nowak J., Strzałkowska E.
Gospodarka Surowcami Mineralnymi
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2018
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vol. 34
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issue 2
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