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- W1586536660 abstract "Nanocrystal Y2O3 powders with different grain sizes and various doping concentrations of Tb3+ were prepared by an autocombustion reaction. The size and surface effects on the 4f-5d transitions and energy transfers between Tb3+ ions were studied by using x-ray diffraction, transmission electron microscopy, fluorescent spectra, and luminescent decay. It was found that the excitation spectra are composed of two parts: one is the contribution from the Tb3+ at/near the nanoparticle surfaces; another is from the Tb3+ inside the nanoparticles. The study on the concentration quenching and luminescent decay indicated that the energy transfers depopulating the D53 and D54 level were assigned to the mechanisms of electric dipole-dipole and exchange interaction, respectively. The size confinement greatly affects the energy transfer quenching the emission from the D53 level, but slightly affects the energy transfer quenching the emission from the D54 level." @default.
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- W1586536660 date "2007-11-01" @default.
- W1586536660 modified "2023-10-16" @default.
- W1586536660 title "Size-dependent excitation spectra and energy transfer in Tb3+-doped Y2O3 nanocrystalline" @default.
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- W1586536660 doi "https://doi.org/10.1063/1.2803502" @default.
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