RESUMO
Eu3+ -doped MCeO3 (M==Sr, Ba) powder samples were prepared by a solid-state method, and their characteristics were investigated by the use of XRD an d fluorescence spectra. The XRD results show that Eu3+ ions hav e a preferencefor M2+ over Ce4+ sites in MCeO3 (M==Sr, Ba) lattice. The excitation spectra of SrCeO3:Eu3+ and BaCeO3:Eu3+ display a much broad absorption band peaking at about 311 nm and 320 nm, respectively. This broad band is attributed to the charge transfer from O0- to Ce4+ and the energy transfer from SrCeO3 and BaCeO3 to Eu3+. In the MCeO3:Eu3+ samples, the emission transitions of Eu3+ originating from (5)D1 and (5)D0 excited states can be observed, among which the (5)D0--(7)F1 magnetic-dipole transition is the most intense emission. The emission of Eu3+ from the Eu3+ doped SrCeO3 lattice is much stronger than that of Eu3+ from the Eu3+ doped BaCeO3 lattice.