Abstract
Sodium praseodymium orthophosphate Na3Pr(PO4)2 was prepared using high temperature molten salt method and structurally characterized by single-crystal X-ray diffraction (SC-XRD) analysis. Its structure can be modeled as a four-dimensional (4D) commensurately modulated structure with orthorhombic superspace group Pca21(0 1/3 0)000 or as a conventional 3D superstructure description. The structure contains PrO8, NaO6, NaO7 and PO4 polyhedra, which are in six types of linear array along the a-axis. Furthermore, the excitation and emission spectra, decay time and Commission International de l’Éclairage (CIE) chromaticity index of Na3Pr(PO4)2 were studied. Under blue light excitation (468nm), the powdered Na3Pr(PO4)2 calcined at 1200°C shows the strongest red emission at around 610nm, which originates from the 3P0→3H6 and 1D2→3H4 transformations of Pr3+ ion.
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