Abstract
The Photoluminescence (PL) spectra of Gd 2O 3:Eu composed of cubic and monoclinic structure were collected on November 2003 and June 2006, respectively. The results show that a portion of cubic Gd 2O 3 transforms into monoclinic after the sample was left as it is for two years; and the 5D 1– 7F J emission of Eu 3+ in cubic host was enhanced in this released complex. Considering the high pressure behavior of Gd 2O 3, we think this structural transition is due to the sample that endures a process of press and release while the residual stress is released slowly.
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