Abstract
Far-red emitting La3Li5Sb2O12: Mn4+ garnet-like phosphors were synthesized by high temperature solid-state reaction method. The crystal structure, concentration, and temperature-dependent luminescence properties of phosphors and the Light Emitting Diode (LED) device performances were investigated in detail. La3Li5Sb2O12: Mn4+ phosphors can be efficiently excited by near-UV to blue light and exhibit far-red emission centered around 710 nm, which was due to the 2Eg→4A2g transition of Mn4+ ions. The emission band of phosphors can be well matched with the absorption bands of phytochrome PFR. Remarkably, the luminescence intensity of the La3Li5Sb2O12: Mn4+ phosphor obtained at 423 K could maintain 77.49 % of that at room temperature, demonstrating its excellent luminescence thermal stability. A prototype LED device was constructed, indicating that the La3Li5Sb2O12: Mn4+ phosphor has potential applications in plant cultivation.
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