Eu3+-doped Gd1-xYxCa4O(BO3)3solid solutions in the form of nanopowders with mean particle size of about 50 nm were prepared by sol-gel method for x = 0.13, 0.44 and 0.60. X-ray examination revealed that compounds prepared by this method are single phase in contrast to compounds prepared by solid state reaction. Room temperature VUV-UV excitation spectra of the5D0emission and corresponding VUV-excited emission spectra of Eu3+were recorded using synchrotron radiation. In addition the excitation spectra in the visible region and the5D0luminescence decay curves were measured. Spectroscopic features of nanopowders prepared by sol-gel method were compared with those evaluated for single crystal samples grown by the micro-pulling down technique from charge prepared by sol-gel method. It has been concluded that the sol-gel method facilitates the control of stoichiometry and structural stability of compounds under study. © 2007 Elsevier B.V. All rights reserved.
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