Broadband near-infrared luminescence in the novel Li3Cs2Sr2B3P6O24:Cr3+phosphor for NIR pc-LED

Broadband phosphors materials with near-infrared emission have recently gained significant attention for their applications in bio-medication and bio-imaging, phototherapy, night vision, non-destructive diagnostic solution, and quality/risk control of food. This study introduces a novel phosphor material with a broad NIR emission spanning 700-1100 nm. Under 450 nm excitation, this material features a wide full width at half maximum (FWHM) of 170 nm. This broad-spectrum emission results from Cr3+ ion occupancy at Sr2+ sites. A promising quantum yield (PLQY) of 34.7 % was measured. The emission intensity at 423 K maintains 31.3 % of that at 298 K, which needs to be improved. Moreover, successful fabrication of packaged near-infrared phosphor-converted LEDs (pc-LEDs) displaying a broad emission centered on 890 nm further underscores the exceptional potential of Li3Cs2Sr2B3P6O24:Cr3+ phosphors in the realm of broadband NIR pc-LED applications.