Abstract
A double perovskite Sr2ZnMoO6:Mn4+ (SZM:Mn4+) phosphor is synthesized by high-temperature solid-state reaction method in air. Emission band peaking at ∼705 nm of SZM:Mn4+ phosphor in the range of 650–790 nm is attributed to the 2E → 4A2 transition of Mn4+ ion with activated different lattice vibration modes. Three excitation bands in the range of 210–610 nm are assigned to the O2− → Mn4+ charge transfer and the 4A2 → (4T1, 2T2, and 4T2) transition of Mn4+ ion. The optimal Mn4+ ion concentration is ∼0.8 mol% in SZM:Mn4+ phosphor. Fluorescence lifetime of SZM:Mn4+ phosphor decreases from ∼132 μs to 108 μs with increasing Mn4+ ion concentration in the range of 0.2–1.0 mol%. Time-resolved spectra and fluorescence lifetime data indicate that luminescent center is caused by Mn4+ ion. The luminous mechanism of SZM:Mn4+ phosphor is explained by Tanabe-Sugano energy level diagram of Mn4+ ion. The results are useful to understand the influences of the neighboring coordination environment around Mn4+ and host crystal structure to the luminescence properties of Mn4+ ion and develop other novel Mn4+-doped materials.
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