Synthesis, energy transfer and tunable emission properties of SrSb2O6:Eu3 +, Bi3 + phosphor

Host SrSb 2 O 6 , SrSb 2 O 6 :Bi 3   + , SrSb 2 O 6 :Eu 3   + , and SrSb 2 O 6 :Eu 3   + , Bi 3   + phosphors are synthesized by solid state reaction method in air. Host SrSb 2 O 6 with excitation 254   nm shows weak green-yellow emission in the range of 320–780   nm due to Sb 5   +   →   O 2– transition. SrSb 2 O 6 :Bi 3   + phosphor with excitation 365   nm emits green light within the range 400–650   nm owing to the 3 P 1   →   1 S 0 transition of Bi 3   + ion. SrSb 2 O 6 :Eu 3   + phosphor with excitation 254   nm exhibits a systematically varied hue from green to orange-red light by increasing Eu 3   + concentration from 0 to 7   mol%, and that with excitation 394   nm only shows orange-red light. The optimal Eu 3   + concentration is ~   4   mol% in SrSb 2 O 6 :Eu 3   + phosphor. SrSb 2 O 6 :Eu 3   + , Bi 3   + phosphor with excitation 254 and 394   nm emits orange-red light. Emission intensity of SrSb 2 O 6 :Eu 3   + phosphor may be enhanced >   2 times by co-doping Bi 3   + ion because of the fluxing agent and energy transfer roles of Bi 3   + ion in SrSb 2 O 6 :Eu 3   + , Bi 3   + phosphor. The luminous mechanism of SrSb 2 O 6 :Eu 3   + , Bi 3   + phosphor is analyzed and explained by the simplified energy level diagrams of Sb 2 O 6 2   − group, Bi 3   + and Eu 3   + ions, and energy transfer processes between them.