Synthesis, crystal structure and photoluminescence properties of novel far-red-emitting SrLaZnSbO6:Mn4+ double-perovskite phosphors for plant cultivation LEDs

In this work, we demonstrated novel Mn4+-activated double-perovskite SrLaZnSbO6 (SLZS) far-red-emitting phosphors for plant cultivation LED lighting. These SLZS:Mn4+ far-red-emitting phosphors doped with various Mn4+ concentrations were successfully prepared by using a traditional high-temperature solid-state reaction route. The phase purity, crystal structure, photoluminescence properties, decay lifetimes, CIE chromaticity co-ordinates and temperature-dependent spectra of as-prepared samples were systematically studied. The SLZS: Mn4+ phosphors showed an intense far-red emission band in the 650-800 nm spectral region with a maximum at 706 nm under 364 nm excitation, which was due to the E-2(g) -> (4)A(2g) transition of Mn4+ ions. The optimal doping concentration of Mn4+ ions in SLZS:Mn4+ phosphors was found to be 0.5 mol%. And the CIE chromaticity co-ordinates of SLZS:0.5 %Mn4+ phosphors were calculated to be (0.7276, 0.2724), which were located in the farred region. The emission spectrum of SLZS:Mn4+ phosphors could match well with the absorption band of phytochrome P-FR. All of these results demonstrate that SLZS:Mn4+ phosphors have a huge potential application in indoor plant cultivation.

Automated summary

In this study, novel Mn4+-activated double-perovskite SrLaZnSbO6 (SLZS) far-red-emitting phosphors for plant cultivation LED lighting were demonstrated. The optimal doping concentration of Mn4+ ions in SLZS:Mn4+ phosphors was found to be 0.5 mol%, with emission spectrum matching well with phytochrome P-FR absorption band. These results suggest a huge potential application of SLZS:Mn4+ phosphors in indoor plant cultivation.