Abstract
Increases of emission intensities for Eu3+ at the S6 site relative to that at the C2 site were observed as UV excitation wavelength decreases from 300 nm to 200 nm in both bulk and nanocrystalline cubic Y2O3:Eu3+. Decomposition of excitation spectra shows that the charge transfer band of Eu3+ at the S6 site lies in the high-energy side of that at the C2 site, resulting in that the energy transfer from the host prefers to the S6 site. Detailed emission and excitation spectral characteristics were analyzed and discussed. In addition, spectral red-shift were found in both charge transfer bands in nanocrystalline Y2O3:Eu3+ compared to the bulk material. The number ratio of S6 sites to C2 sites is also smaller in nanocrystalline Y2O3:Eu3+ than that in the bulk one.
Original language | English |
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Pages (from-to) | 45-48 |
Number of pages | 4 |
Journal | Journal of Rare Earths |
Volume | 22 |
Issue number | 1 |
State | Published - Feb 2004 |
Scopus Subject Areas
- General Chemistry
- Geochemistry and Petrology
Keywords
- Charge transfer band
- Nano-phosphor
- Rare earths
- UV excitation