Abstract
Li2Mg3SnO6:Mn4+ deep red phosphor is synthesized by high-temperature solid-state reaction method in air. With excitation 330 and 480nm, the emission band peaking at ∼670nm within the range 600–790nm is observed owing to the 2E→4A2 transition of Mn4+ ion. Excitation bands peaking at ∼330, 395, and 480nm in the range of 220–600nm indicate that Li2Mg3SnO6:Mn4+ phosphor can be effectively excited by (near) ultraviolet and blue light-emitting diode chips. The optimal Mn4+ ion concentration is ∼0.4 mol%. Fluorescence lifetime and quantum efficiency of Li2Mg3SnO6:0.4%Mn4+ phosphor with excitation 330nm are ∼266.67μs and 36.3%, respectively. The luminous mechanism is explained by the Tanabe-Sugano energy level diagram of Mn4+ in the octahedron.
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