Synthesis and tunable emission properties of Sm3+ and Mn2+ co-doped CaZn2P2O8 phosphor

A series of CaZn 2 P 2 O 8 :Sm 3+ , Mn 2+ phosphors are synthesized by a solid-state reaction method in air. The crystal structures and luminescence properties are investigated. CaZn 2 P 2 O 8 :Sm 3+ phosphor with excitation 402   nm emits red light in the range of 550–750   nm owing to the 4 G 5/2   →   ( 6 H 5/2 , 6 H 7/2 , 6 H 9/2 , and 6 H 11/2 ) transitions of Sm 3+ ion. CaZn 2 P 2 O 8 :Mn 2+ phosphor with excitation 400   nm emits yellow-green light in the range of 500–650   nm due to the 4 T 1 (G)   →   6 A 1 transition of the Mn 2+ ion. CaZn 2 P 2 O 8 :Sm 3+ , Mn 2+ phosphor with excitation 400   nm shows a tunable emission in the range of 500–750   nm with changing Sm 3+ or Mn 2+ ion content. The optimal Sm 3+ and Mn 2+ ion concentrations are ∼4   mol% and 3   mol%, respectively.