Study on the red/far-red emitting Mn4+ doped Y3Al5O12-YAlO3 phosphors for plant growth lighting

Mn 4+ -doped Y3Al5O12-YAlO3 phosphors (YAG-YAP:Mn 4+ ) were successfully fabricated by a solid-state reaction method supported by a highenergy planetary ball milling.X-ray diffraction pattern (XRD) analysis result shows that the obtained product consists of two main Y3Al5O12 (YAP) and YAlO3 (YAG) phases when the sample is annealed at higher temperatures of 1300C.Field emission scanning electron microscopy (FESEM) and X-ray energy dispersion spectrum (EDS) spectra indicate that the high-purity YAG-YAP:Mn 4+ phosphors have a granular form with an average size of about 1-5 m.By photoluminescence excitation (PLE) and photoluminescence spectra investigation, the YAG-YAP: Mn 4+ phosphors, which could be well excited at two wavelengths of 305 and 477 nm, emit