Luminescence Properties of ScPO{sub 4} Single Crystals

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Flux-grown ScPO{sub 4} single crystals exhibit a number of luminescence bands in their x-ray-excited luminescence spectra - including sharp lines arising from rare-earth elements plus a number of broad bands at 5.6 cV, 4.4 eV, and 3 eV. The band at 5.6 eV was attributed to a self-trapped exciton (STE) [l], and it could be excited at 7 eV and higher energies. This luminescence is strongly polarized (P = 70 %) along the optical axes of the crystal and exhibits a kinetic decay time constant that varies from several ns at room temperature to {approximately}10 {micro}s at 60 K and ... continued below

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7 pages

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Boatner, L. A. & Trukhin, A. N. August 16, 1999.

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Description

Flux-grown ScPO{sub 4} single crystals exhibit a number of luminescence bands in their x-ray-excited luminescence spectra - including sharp lines arising from rare-earth elements plus a number of broad bands at 5.6 cV, 4.4 eV, and 3 eV. The band at 5.6 eV was attributed to a self-trapped exciton (STE) [l], and it could be excited at 7 eV and higher energies. This luminescence is strongly polarized (P = 70 %) along the optical axes of the crystal and exhibits a kinetic decay time constant that varies from several ns at room temperature to {approximately}10 {micro}s at 60 K and up to {approximately}1 ms at 10 K. It is assumed that the STE is localized on the SC ions. The band at 3 eV can be excited in the range of the ScPO{sub 4} crystal transparency (decay time = 3 to 4 {micro}s.) This band is attributed to a lead impurity that creates different luminescence centers. At high temperatures, the band at 4.4 eV is dominant in the x-ray-excited TSL and afterglow spectra. Its intensity increases with irradiation time beginning at zero at the initial irradiation time. The 4.4 eV band does not appear in a fast process under a pulsed electron beam, showing that accumulation is necessary for its observation. A sample of ScPO{sub 4} doped with vanadium exhibited a prevalent band at 4.4 eV at T = 480 K.

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7 pages

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OSTI as DE00010471

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  • 5th International Conference on Inorganic Scintillators and Their Applications (SCINT99), Moscow (RU), 08/16/1999--08/20/1999

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  • Report No.: ORNL/CP-104321
  • Report No.: KC 02 02 02 0
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 10471
  • Archival Resource Key: ark:/67531/metadc620345

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  • August 16, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 2, 2016, 3:56 p.m.

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Boatner, L. A. & Trukhin, A. N. Luminescence Properties of ScPO{sub 4} Single Crystals, article, August 16, 1999; Tennessee. (digital.library.unt.edu/ark:/67531/metadc620345/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.