Site-selective spectra and time-resolved spectra of nanocrystalline Y2O3:Eu

Nanocrystalline Y2O3:Eu of cubic crystal structure with different particle size was prepared by combustion reaction. High-resolution electron microscope images and extended X-ray absorption fine structure (EXAFS) analysis of the nanoscale samples indicate defected crystalline particles and co-existence of an amorphous phase. Novel emission bands centered at 613 and 622 nm with a lifetime of 0.4 ms emerge in nanoscale Y2O3:Eu. Site-selective spectra and time-resolved spectra show that the novel emission bands are from the amorphous phase in nanoscale samples.