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Title: Luminescence Properties of ScPO{sub 4} Single Crystals

Abstract

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 amore » 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.« less

Authors:
;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
10471
Report Number(s):
ORNL/CP-104321; KC 02 02 02 0
KC 02 02 02 0; TRN: AH200126%%382
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Conference
Resource Relation:
Conference: 5th International Conference on Inorganic Scintillators and Their Applications (SCINT99), Moscow (RU), 08/16/1999--08/20/1999; Other Information: PBD: 16 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AFTERGLOW; DECAY; ELECTRON BEAMS; EXCITONS; IRRADIATION; KINETICS; LUMINESCENCE; MONOCRYSTALS; SPECTRA; VANADIUM; SELF-TRAPPED EXCITON; SCANDIUM ORTHOPHOSPHATE

Citation Formats

Boatner, L.A., and Trukhin, A.N. Luminescence Properties of ScPO{sub 4} Single Crystals. United States: N. p., 1999. Web.
Boatner, L.A., & Trukhin, A.N. Luminescence Properties of ScPO{sub 4} Single Crystals. United States.
Boatner, L.A., and Trukhin, A.N. Mon . "Luminescence Properties of ScPO{sub 4} Single Crystals". United States. https://www.osti.gov/servlets/purl/10471.
@article{osti_10471,
title = {Luminescence Properties of ScPO{sub 4} Single Crystals},
author = {Boatner, L.A. and Trukhin, A.N.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

Conference:
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