Abstract
Near-infrared (NIR) light sources have been widely used in spectroscopy. The multi-lattice site occupation strategy is an effective approach to realize the multifunctional application of phosphors. Here, a novel double lattice site-occupied K4Ga3Ta(PO4)6:Cr3+ phosphor is reported. The concentration-dependent luminescence properties of two-site Cr3+ were investigated. The Cr1 site has a dominant role in the luminescence performance of the material. When x = 0.15, the Cr1 site has the highest luminescence percentage, and K4Ga2.85Ta(PO4)6:0.15Cr3+ shows the best luminescence performance. Under 463nm excitation, the emission peak of K4Ga2.85Ta(PO4)6:0.15Cr3+ is centered at 873nm, and the full width at half maximum (FWHM) is 188nm. The fabricated NIR device with this material shows potential applications in night vision, compositional analysis, and bio-imaging.
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