Abstract
Host SrSb2O6, SrSb2O6:Bi3+, SrSb2O6:Eu3+, and SrSb2O6:Eu3+, Bi3+ phosphors are synthesized by solid state reaction method in air. Host SrSb2O6 with excitation 254nm shows weak green-yellow emission in the range of 320–780nm due to Sb5+→O2– transition. SrSb2O6:Bi3+ phosphor with excitation 365nm emits green light within the range 400–650nm owing to the 3P1→1S0 transition of Bi3+ ion. SrSb2O6:Eu3+ phosphor with excitation 254nm exhibits a systematically varied hue from green to orange-red light by increasing Eu3+ concentration from 0 to 7mol%, and that with excitation 394nm only shows orange-red light. The optimal Eu3+ concentration is ~4mol% in SrSb2O6:Eu3+ phosphor. SrSb2O6:Eu3+, Bi3+ phosphor with excitation 254 and 394nm emits orange-red light. Emission intensity of SrSb2O6:Eu3+ phosphor may be enhanced >2 times by co-doping Bi3+ ion because of the fluxing agent and energy transfer roles of Bi3+ ion in SrSb2O6:Eu3+, Bi3+ phosphor. The luminous mechanism of SrSb2O6:Eu3+, Bi3+ phosphor is analyzed and explained by the simplified energy level diagrams of Sb2O62− group, Bi3+ and Eu3+ ions, and energy transfer processes between them.
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