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A series of new red-orange emission phosphors Na 2 BaMg(PO 4 ) 2 :Pr 3+  were synthesised by a high-temperature solid-state reaction. The crystal structure and photoluminescence properties of these samples were characterised by X-ray diffraction and spectroscopic measurements. This compound holds  P 3̅ m 1 space group of the trigonal system with the lattice parameters of hexagonal cell  a =0.5304(3) nm and  c =0.6989(3) nm. The phosphor emits the strongest peak at 606 nm when excited by 449 nm. The average Commission Internationale de l’Eclairage chromaticity coordinates calculated for the phosphors are (0.52, 0.46). The results demonstrate the potential application of these phosphors in solid-state lighting and other fields.

Novel Red-Orange Phosphors Na 2 BaMg(PO 4 ) 2 :Pr 3+ : Synthesis, Crystal Structure and Photoluminescence Performance