A novel broadband near-infrared Ca₂Y₃Sb₃O₁₄: Cr³⁺ rhombohedral pyrochlores phosphor and its application in pc-LEDs

Recently, there has been a growing demand for broadband near-infrared (NIR) phosphor. The paper proposes a novel Cr3+ doped Ca2Y3Sb3O14 phosphor through basic research of Ca(2)Ln(3)Sb(3)O(14): Cr3+ (Ln = Sc, Lu, and Y) phosphor. Under 467 nm excitation, Ca2Y3Sb3O14: Cr3+ phosphor shows a broad NIR emission band (650-950 nm) centered at 776 nm with a full width at half-maximum of 110 nm. The optimal Cr3+ doping concentration is 0.05, with an internal quantum efficiency of 78%. Meanwhile, the photoluminescence emission intensity at 373 K remains 61.3% of that at room temperature. Using phosphor-in-glass technology, a glass-ceramic plate showed a slight improvement in its thermal stability compared to the pure phosphor. Combining Ca2Y3Sb3O14: 0.05Cr(3+) phosphor with a commercial blue-light-emitting chip presents an output power of 44.51 mW with a photoelectric conversion efficiency of 14.78% at a drive current of 100 mA. These results suggest that the Ca2Y3Sb3O14: Cr3+ phosphor has great potential in the pc-light-emitting diodes.