Structural characterization and luminescence properties of Cr3+ activated ZnMgTiO4 far-red emitting phosphor

Cr 3+ doped ZnMgTiO 4 phosphors were successfully prepared with a high-temperature solid-state reaction method. The Cr 3+ doped ZnMgTiO 4 phosphor exhibits a near-infrared emission around 620–870 nm with a peak at 720 nm under UV 325 nm excitation. The emission peak at around 720 nm is related to the 2 E →  4 A 2 transition of Cr 3+ , which matches the absorption spectra of phytochrome P FR . The structure and crystal field environment were studied and discussed. The Cr concentration and temperature dependent photoluminescence properties of ZnMgTiO 4 : Cr 3+ were also investigated. This study indicates that ZnMgTiO 4 : Cr 3+ phosphor has a promising potential for plant cultivation.