Abstract
Abstract Terbium (III)-doped yttrium oxysulfate Y2O2SO4:Tb3+ was synthesized by the 1000 °C calcination of Tb3+-doped dodecylsulfate-templated yttrium oxide mesophases with straight-layered (S-type) and concentric-layered (C-type) structures. The Tb3+-doped oxysulfates exhibited luminescence bands including the 5D4–7F5 transition with a tendency in intensity to saturate or reach a maximum at 13–25 mol% Tb doping. The maximum intensity of Tb3+ emission for the C-type-mesophase-mediated Y2O2SO4:Tb3+ was 1.44 times stronger than that for the S-type-mesophase-mediated analogues, although the Eu3+ emissions for C-type-mesophase-mediated Y2O2SO4:Eu3+ was enhanced in intensity up to three times stronger than those for S-type-mesophase-mediated ones. It is suggested from FT-IR data that any specific deformation of sulfate groups is induced for both emission systems by the conversion of concentric dodecylsulfate-layers into straight sulfate-layers in the oxysulfate framework upon calcination. This leads to the enhanced emission for the Eu3+-doped system, whereas the emission of Tb3+ in the same Y2O2SO4 matrix is slightly enhanced because the electronic state of 4f8 for Tb3+ ion is insensitive to the change of the distribution of the surrounding negative-charged oxide ions.
Published Version
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