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Nanosized Y2O3: Eu was synthesized by using a solution–combustion method. The samples were characterized by x-ray diffraction, extended x-ray absorption fine structure (EXAFS), and photoluminescence spectroscopy. Our EXAFS result showed that the local environments surrounding both Y and Eu atoms had obviously changed when the particle size was smaller than 10 nm. The coordination number and the bond length of Y (Eu)–O shell increased and the disorder became larger. This change also produced an emission peak and the charge-transfer band showed an unusual redshift as the particle size decreased. The luminescence properties can be explained by use of the EXAFS results.© 2002 American Institute of Physics. DOI: 10.1063/1.1513659

Y2O3: Eu has attracted much attention because of its high brightness as a red color phosphor, acceptable atmospheric stability, reduced degradation under …