Synthesis, energy transfer and luminescence properties of Ca2MgWO6:Sm3+, Bi3+ phosphor

Novel Ca 2 MgWO 6 :Sm 3+ , Bi 3+ phosphor is synthesized by solid-state reaction method in air. Host Ca 2 MgWO 6 with excitation 300   nm emits blue light. Ca 2 MgWO 6 :Bi 3+ phosphor with excitation 300 and 338   nm emits yellow light. Ca 2 MgWO 6 :Sm 3+ phosphor with excitation 300   nm exhibits tunable emission from blue to red light by increasing Sm 3+ doping concentration from 0 to 8   mol%, however, only emits red light with excitation 407   nm. Ca 2 MgWO 6 :Sm 3+ , Bi 3+ phosphor with excitation 300 and 338   nm emits red light. The optimal Sm 3+ doping concentration is ∼5   mol% in Ca 2 MgWO 6 :Sm 3+ phosphor. After Bi 3+ ion is co-doped, luminescence properties of Ca 2 MgWO 6 :Sm 3+ phosphor can be improved obviously because of Bi 2 O 3 as fluxing agent role and energy transfer from Bi 3+ to Sm 3+ ions. The possible luminous mechanism of Ca 2 MgWO 6 :Sm 3+ , Bi 3+ phosphor is analyzed and explained by simplified energy level diagrams of WO 6 6− group, Bi 3+ and Sm 3+ ions.