Synthesis and photoluminescence properties of novel Sr3LiSbO6:Mn4+ red phosphor for indoor plant growth

Far red-emitting Mn4+ activated oxide phosphors based on the substitution of Mn4+ for Sb5+ in the lattice of Sr3LiSbO6 (SLSO) was prepared via solid state reaction process. The phases and micrographs of powders were analyzed by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The luminescent properties of the samples with varying Mn4+ concentrations were investigated, and the result indicates that prepared phosphor SLSO:Mn4+ can be excited by (UV) light and exhibit intense far red emission at 698 nm. This emission band is well matched with the absorption band of phytochrome P-FR. The mechanism of quenching concentration has been investigated. The thermal stability and thermal quenching concentration of SLSO:Mn4+ were discussed. In addition, the internal quantum efficiency (IQE) has been tested and calculated. All the above results suggest that the SLSO:Mn4+ phosphors have great potential applications in plant growth n-UV LEDs.