Preparation and Photoluminescence Properties of SrNb_2O_6:Eu~(3+),Bi~(3+) Red-Emitting Phosphor

Rare earth Eu3+-doped SrNb2O6 red-emitting phosphor was prepared by high temperature solid-state reaction.Structure and photoluminescence properties(PL) of the samples were characterized by X-ray diffraction(XRD),fluorescence spectrophotometer,respectively,meanwhile the effect of the co-activator Bi3+ on the PL of the SrNb2O6:Eu3+ phosphor was studied in detail.Results showed that the pure phase of SrNb2O6 could be available at the calcination temperature of 1 200 ℃.Sr1-xNb2O6:Eux3+ phosphors could be effectively excited by the near-UV irridiation(395 nm) and emit red light at 614 nm due to the forced electric dipole 5D0 → 7F2 transitions on Eu3+,which indicated that Eu3+ occupied the non-inversion the symmetry sites in the SrNb2O6 host lattice.When the content of doped-Eu3+ was up to 15%,the PL intensity of SrNb2O6:Eu3+ reached the highest.So the Sr0.85Nb2O6:Eu3+0.15 phosphor could be a promising red component for possible applications in the white LED.The addition of the co-activator Bi3+ increased the PL intensity of the SrNb2O6:Eu3+ phosphor at about 325 nm,while decreased the PL intensity at 395 nm.