Abstract
The efficient new red emitting scheelite-type compounds, Eu3+-doped (5 mol.%) Y(Zr0.5W0.5)O4, Lu(Zr0.5W0.5)O4 and Y(Y1/3W2/3)O4, were successfully prepared. The crystal structure, photoluminescence and decay properties of the obtained phosphors were investigated. Shifts of the peaks in the XRD patterns were observed when Y3+ sites in the host were occupied by Lu3+ or Zr/W sites were occupied by Y/W. As a result of the crystallographic occupancy of Eu3+ located at the cation positions without inversion symmetry, under O→Zr/W and O→Eu3+ ligand-to-metal charge-transfer states (LMCT) excitation at 300 nm, the emission spectra of these compounds presented 5D0→7F2 transition for Eu3+ at 612 nm. The diagram of Eu3+ energy levels in these new scheelite-type compounds and the energy transfer processes were discussed.
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