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Title: Characterization and luminescence properties of sol–gel derived M′-type LuTaO{sub 4}:Ln{sup 3+} (Ln = Pr, Sm, Dy) phosphors

Graphical abstract: Emission spectra of LuTaO{sub 4}:Ln (Ln = Pr, Sm and Dy) phosphors under X-ray excitation. The insets illustrate their SEM micrographs. - Highlights: • M′-type LuTaO{sub 4}:Ln{sup 3+} (Ln = Pr, Sm, Dy) phosphors were synthesized by sol–gel technique. • The phosphors exhibited an efficient energy transfer from the host to activators. • High intensity of activator emission was achieved under X-ray excitation. • The phosphors are encouraging for application in high-spatial-resolution X-ray CT imaging. - Abstract: M′-type Lu{sub 1−x}Ln{sub x}TaO{sub 4} (Ln = Pr, Sm, Dy) phosphors have been successfully synthesized by sol–gel technique, their crystallization, morphology, photoluminescence and X-ray excited luminescence properties were investigated in detail. The phosphors had good crystallization behavior. The optimum doping concentrations of Pr{sup 3+}, Sm{sup 3+} and Dy{sup 3+} in LuTaO{sub 4} were at x = 0.003, 0.025, 0.02, respectively. They exhibited a more efficient host excitation relative to the 4f–4f excitations of the rare-earth ions, and a dominant {sup 1}D{sub 2} → {sup 3}H{sub 4}, {sup 4}G{sub 5/2} → {sup 6}H{sub 7/2} or {sup 4}F{sub 9/2} → {sup 6}H{sub 13/2} emission for Pr{sup 3+}, Sm{sup 3+} or Dy{sup 3+}, respectively, which corresponds to the average decay time of 21.7, 745.7more » or 10.0 μs, respectively. It is expected that Pr{sup 3+}- or Dy{sup 3+}-doped LuTaO{sub 4} phosphors with a microsecond level decay time are very encouraging for applications in X-ray computerized tomographic imaging with high spatial resolution.« less
Authors:
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Publication Date:
OSTI Identifier:
22420709
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 60; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPUTERIZED TOMOGRAPHY; CONCENTRATION RATIO; CRYSTALLIZATION; DOPED MATERIALS; DYSPROSIUM IONS; EMISSION SPECTRA; EXCITATION; LUTETIUM COMPOUNDS; MORPHOLOGY; PHOSPHORS; PHOTOLUMINESCENCE; PRASEODYMIUM IONS; SAMARIUM IONS; SCANNING ELECTRON MICROSCOPY; SOL-GEL PROCESS; TANTALATES; X-RAY DIFFRACTION