Abstract
Novel double-perovskite Sr2ZnWO6:Mn4+(SZW:Mn4+) phosphor is synthesized by high-temperature solid-state reaction method in air. SZW:Mn4+ phosphor with excitation at 325 and 526nm emits deep-red light, the chromaticity coordinate is (0.7315,0.2685), and the emission band peaking at ~702nm within the range 640–760nm is assigned to the 2E→4A2 transition of Mn4+ ion. The influences of “Mn4+- ligand” bonding and crystal field strength to emission properties of Mn4+ ion are analyzed. The optimal Mn4+ ion concentration in SZW:Mn4+ phosphor is ~0.8mol%. Lifetime of SZW:Mn4+ phosphor decreases from 554.77 to 401.35μs with increasing Mn4+ ion concentration in the range of 0.2–1.0mol%. The lifetime data and decay curves indicate that there is only a single type of Mn4+ ion luminescent center in SZW:Mn4+ phosphor. The luminous mechanism of SZW:Mn4+ phosphor is analyzed by Tanabe-Sugano energy level diagram of Mn4+ in the octahedron together with the simple energy level diagram. The experimental results are helpful to research the influences of the neighboring coordination environment around Mn4+ and host crystal structure to the luminescence properties of Mn4+ ion and to deeply understand other Mn4+-dopedmaterials.
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