Luminescence Properties of ScPO{sub 4} Single Crystals

Conference · Mon Aug 16 04:00:00 EDT 1999

OSTI ID:10471

Boatner, L A ^[1]; Trukhin, A N

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1. ORNL

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.

• Research Organization: Oak Ridge National Lab., TN (US)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 10471
• Report Number(s): ORNL/CP-104321; KC 02 02 02 0; KC 02 02 02 0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AFTERGLOW
DECAY
ELECTRON BEAMS
EXCITONS
IRRADIATION
KINETICS
LUMINESCENCE
MONOCRYSTALS
SCANDIUM ORTHOPHOSPHATE
SELF-TRAPPED EXCITON
SPECTRA
VANADIUM