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1.This assumption could be verified by the presence of the very weak 5D0→7F0 emission at 579 nm in the emission spectra since the 5D0→7F0 emission is only allowed for Cs, Cn, Cnv site symmetry. 2. Numerous papers have reported that the addition of alkali metal ions into the rare-earth-doped materials results in a significant enhancement of the lumi-nescence properties,which is all based on the modifications of the local symmetry and the surroundings near the rare earth ions by the addition of coactive ions or harge compensators of alkali metal ions. 3.sample 1 showed a lattice expansion which is followed by a decreased axial ratio of c/a in comparison with sample 2. The c/a value tending to 2 corresponded to the ideal structure of equal cation coordination.Consequently, the increase of c/a value indicated the enhanced asymmetry ratio, which agrees with the ratios of structural hypersensitive R/O (intensity ratio of transition 5D0→7F2 to 5D0→7F1). 4.The structural refinements of XRD data for Ca1-2x(Eu,Na)2xWO4 nanocrystals (inset of Figure 5) show that for x≤0.122. 5.the influences of these transitions on the depopulation of 5D0 excited level were neglected. |
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