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Fe 3+  undoped and doped CaWO 4 : Pr 3+  phosphors have been successfully synthesised by using the solid-state reaction method. The products were characterised by powder X-ray diffraction (XRD), photoluminescence (PL) and fluorescence lifetime testing techniques, respectively. The mean crystallite size (50.7 nm) of CaWO 4 : Pr 3+  is obtained from powder XRD data. PL spectra of both Fe 3+  undoped and doped CaWO 4 : Pr 3+  phosphors exhibit excitation peaks at 214, 449, 474, and 487 nm under monitor wavelength at 651 nm, and emission peaks at 532, 558, 605, 621, 651, 691, 712, and 736 nm under blue light ( λ  em =487 nm) excitation. The effect of trace Fe 3+  on luminescence properties of CaWO 4 : Pr 3+  phosphor is studied by controlling the doping concentration of Fe 3+ . The results show that radioactive energy transfers from luminescence centre Pr 3+  to quenching centre Fe 3+  occurred in Fe 3+  doped CaWO 4 : Pr 3+  phosphors. With the increasing concentration of Fe 3+ , the energy transfer from Pr 3+  to Fe 3+  is enhanced, and the emission intensity of CaWO 4 : Pr 3+  will be lower. The decay times (5.22 and 4.99 μs) are obtained for typical samples Ca 0.995 WO 4 : Pr 3+  0.005  and Ca 0.99275 WO 4 : Pr 3+  0.005 , Fe 3+  0.00225 , respectively. This work shows that nonferrous phosphors can improve the luminescent intensity of the phosphors.

Effect of Trace Fe 3+ on Luminescent Properties of CaWO 4 : Pr 3+ Phosphors