For efficient near-infrared (NIR) emitters, tuning their luminescence properties is important for their extended optical applications. A fundamental study of garnet-type inorganics has led to the development of a new NIR phosphor Y₃ScAl₄O₁₂:Cr³⁺ (YSAO:Cr³⁺), exhibiting emission in the range of 600 to 950 nm, an internal quantum efficiency (IQE) of 84.01%, and good thermal stability at 423 K (89.7% of that at room temperature). Doping with Yb³⁺/Nd³⁺ ions helps achieve an efficient energy transfer from the Cr³⁺ to Yb³⁺/Nd³⁺ ions with excellent thermal stability. NIR pc-LED devices prepared using YSAO:Cr³⁺,Yb³⁺ and YSAO:Cr³⁺,Nd³⁺ can achieve high NIR output powers of 46.37 and 42.82 mW at 100 mA and photoconversion efficiencies of 20.27 and 18.84% at a driving current of 20 mA, respectively. Furthermore, the NIR pc-LED package demonstrated excellent capability for penetrating biological tissues, effectively distinguishing between pork, chicken, and beef. These results suggest that the phosphors can be utilized for non-destructive monitoring applications.

中文翻译：

---

通过 Cr3+–Yb3+/Nd3+ 共活化 NIR 荧光粉中的 Cr3+–Yb3+/Nd3+ 能量转移进行可调谐发光，用于无损分析


对于高效的近红外 （NIR） 发射器，调整其发光特性对于其扩展光学应用非常重要。对石榴石型无机物的基础研究导致了一种新的近红外荧光粉 Y₃ScAl₄O₁₂：Cr³⁺ （YSAO：Cr³⁺） 的开发，其发射波长为 600 至 950 nm，内部量子效率 （IQE） 为 84.01%，在 423 K 下具有良好的热稳定性（室温下的 89.7%）。掺杂 Yb³⁺/Nd³⁺ 离子有助于实现从 Cr³⁺ 到 Yb³⁺/Nd³⁺ 离子的高效能量转移，具有优异的热稳定性。使用 YSAO：Cr³⁺、Yb³⁺ 和 YSAO：Cr³⁺，Nd³⁺ 制备的近红外 pc-LED 器件可在 100 mA 下实现 46.37 和 42.82 mW 的高近红外输出功率，在 20 mA 的驱动电流下分别实现 20.27% 和 18.84% 的光转换效率。此外，NIR pc-LED 封装表现出出色的穿透生物组织的能力，可有效区分猪肉、鸡肉和牛肉。这些结果表明，荧光粉可用于无损监测应用。