Abstract
M′-type Lu1−xLnxTaO4 (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 Pr3+, Sm3+ and Dy3+ in LuTaO4 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 1D2→3H4, 4G5/2→6H7/2 or 4F9/2→6H13/2 emission for Pr3+, Sm3+ or Dy3+, respectively, which corresponds to the average decay time of 21.7, 745.7 or 10.0μs, respectively. It is expected that Pr3+- or Dy3+-doped LuTaO4 phosphors with a microsecond level decay time are very encouraging for applications in X-ray computerized tomographic imaging with high spatial resolution.
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