Filling the 820–880 nm gap of Fe ³⁺ -activated efficient near-infrared phosphor toward versatile applications

Fe 3+ ion as an activator with eco-friendly nature has an exceptional ability to achieve efficient near-infrared (NIR) luminescence within 700–1100 nm range. However, its emission in 820–880 nm region is rarely reported, limiting the versatile applications of Fe 3+ -activated materials. In this Letter, a double-perovskite KLaMgTeO 6 :Fe 3+ phosphor was developed, which exhibits an emission peak centered at 851 nm, accompanied by a high photoluminescence quantum yield (PLQY) of up to 82%. Furthermore, the fabricated NIR light source demonstrated excellent performance in night-vision, imaging, and non-destructive testing applications. Thus, this study offers an efficient NIR material that covers a previously underexplored emission window, expanding the application landscape of Fe 3+ -doped materials.