Article ID Journal Published Year Pages File Type
1889191 Radiation Measurements 2007 4 Pages PDF
Abstract

The characteristics and luminescent properties of two nanophosphors, Y2SiO5:CeY2SiO5:Ce and Y2O3:TbY2O3:Tb, are reviewed and summarized in this work, with focus on the results obtained in our group. Hydrothermally prepared Y2SiO5:CeY2SiO5:Ce crystallizes in the P21/cP21/c structure rather than the B2/bB2/b structure observed in bulk material. Relative to bulk powder, Y2SiO5:CeY2SiO5:Ce nanophosphors of particle size ∼25∼25–100 nm diameter exhibit red shifts of the photoluminescence excitation and emission spectra, reduced self absorption, enhanced light output, and a medium-dependent radiative lifetime. Perturbation of the Ce ion electric field due to reduced dimensionality of the nanocrystals is responsible for the variable lifetime. Y2O3:TbY2O3:Tb nanophosphors prepared by the solution combustion method exhibit nanocrystals within the 30–70 nm range comprising cubic structure. Photoluminescence emission and excitation measurements show a complex behavior comprised of several sharp lines in the visible spectrum associated with electronic transitions of the Tb+3Tb+3 ion. The maximum of the nanophosphor photoluminescence quenching curve occurs at Tb concentration three times higher than that in the bulk phosphor.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Radiation
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