Abstract
Y 1.8Nd 0.2O 3 and Y 1.8Er 0.2O 3 powder samples were prepared by combustion synthesis. X-ray diffraction showed that the materials are nanostructured, with average coherence length 5–10 nm. The visible and infrared luminescence spectra of nanometric cubic Y 1.8Nd 0.2O 3 and Y 1.8Er 0.2O 3 show some important differences from those of the bulk materials. In the case of Y 1.8Er 0.2O 3, faster relaxation of some excited states occurs, leading to changes in the relative intensities of several optical transitions. As far as nanostructured Y 1.8Nd 0.2O 3 is concerned, the 4 F 3/2→ 4 I 9/2 transition is characterized by a perturbed intensity pattern of the Stark components and by an anomalous integrated intensity. Possible explanations for this behaviour are proposed.
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