稀土学报(英文版)
稀土學報(英文版)
희토학보(영문판)
JOURNAL OF RARE EARTHS
2004年
1期
45-48
,共4页
张家骅%贾明理%吕少哲%骆永石%任新光%王笑军
張傢驊%賈明理%呂少哲%駱永石%任新光%王笑軍
장가화%가명리%려소철%락영석%임신광%왕소군
charge transfer band%UV excitation%nano-phosphor%rare earths
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.
