Synthesis and Luminescence Properties of BaMoO ₄ :Sm ³⁺ Phosphors

Abstract

BaMoO 4 :Sm 3+ phosphor system with a tetragonal structure was synthesized via a high‐temperature solid‐state method. The charge compensated behaviors, 2Ba 2+ →Sm 3+ +M + , where M + is a monovalent cation like Li + , Na + , and K + acting as a charge compensator, were investigated in this paper. It has been found that BaMoO 4 :Sm 3+ phosphor by doping with K + ions show greatly enhanced reddish orange emission compared with pure BaMoO 4 :Sm 3+ sample. Investigation on Sm 3+ and K + concentration‐dependent emission spectra indicated that Ba 0.84 MoO 4 :0.08Sm 3+ ,0.12K + phosphor exhibited the strongest reddish orange emission with a CIE values of x =0.55 and y =0.43. After irradiation under the 402 nm ultraviolet (UV) excitation, three emission peaks centered at 561, 598, and 642 nm corresponding to the 4 G 5/2 to 6 H J ( J =5/2, 7/2, 9/2) emission lines of Sm 3+ were obviously observed, and the lifetimes of three emissions ( 4 G 5/2 → 6 H J =5/2, 7/2, 9/2 ) have been calculated based on the measured decay curves.