Sr3LiSbO6: Mn4+/Eu3+ phosphors for plant growth: Luminescence enhancement and light-converting film demonstration

A series of Mn 4+ /Eu 3+ co-doped double-perovskite Sr 3 LiSbO 6 phosphors was successfully synthesized by the high-temperature solid-state method. The Sr 3 LiSbO 6 : Mn 4+ phosphor exhibits a broad far-red emission band centered at 693 nm, which is assigned to the 2 E g  →  4 A 2g transition of Mn 4+ ions. The doping of Eu 3+ ions realizes the regulation of emission spectra, and the phosphors with red/far-red double-peak emission (611 and 693 nm) are obtained. The spectrum is suitable for plant lighting because of its good overlap with the absorption band of phytochrome P R and P FR . Notably, the presence of Eu 3+ enhances the emission intensity of Mn 4+ by 1.56 times due to the synergistic effect of charge compensation and local lattice tuning. These results indicate that Sr 3 LiSbO 6 : Mn 4+ /Eu 3+ phosphors are promising materials for applications in plant cultivation.