Preparation, characterization, and luminescence properties of double perovskite SrLaMgSbO6:Mn4+ far-red emitting phosphors for indoor plant growth lighting

摘要

Mn ~(4+) -activated SrLaMgSbO _(6) far-red emitting phosphors with double perovskite structure were prepared by traditional solid-state reaction. The research on the crystal structure of the SrLaMgSbO _(6) :0.8%Mn ~(4+) (SLMS:0.8%Mn ~(4+) ) phosphors showed that the as-prepared sample was made up of two polyhedrons, [SbO _(6) ] and [MgO _(6) ]. Under the excitation of 333 nm, the SLMS:0.8%Mn ~(4+) phosphors exhibited an intense far-red emission in the 625–800 nm wavelength range with CIE chromaticity coordinates of (0.733, 0.268), which could match well with the absorption spectrum of phytochrome P _(FR) . The optimal concentration of Mn ~(4+) ions in the SLMS:Mn ~(4+) phosphors was 0.8 mol%. Importantly, the as-prepared SLMS:0.8%Mn ~(4+) phosphors had an internal quantum efficiency of 35%. The thermal stability of SLMS:0.8%Mn ~(4+) phosphors was also investigated, and the activation energy was found to be 0.3 eV. Thus, the Mn ~(4+) -activated SLMS phosphors have great potential to serve as far-red emitting phosphors in indoor plant growth lighting.