A broadband near-infrared (NIR) luminescence that is comparable to chromium ions activated materials is fulfilled in Li3Sc2(PO4)3:Fe3+ phosphor, which is highly desired for environmental and biomedical applications due to the non-toxicity of Fe3+ ions. Structural and spectral analysis reveal that the broadband NIR emission peaked at 805 nm with a full width at half-maximum of 130 nm is derived from the non-selective two-site occupation of Fe3+ in the Sc3+ sites. A high internal/external quantum efficiency of 53 %/38.7 % is achieved via relaxing the selection rule for the forbidden 4T1(4G) → 6A1(6S) transitions of Fe3+ by larger lattice distortion. The influence of Fe3+ concentration and environment temperature on the broadband NIR luminescence properties of the as-prepared phosphors are also investigated. Finally, a NIR pc-LED prototype is fabricated and its electro-optical performance has guaranteed the applications in non-destructive detection and night vision. All the results have validated Li3Sc2(PO4)3 as a novel matrix system for access to highly efficient broadband NIR Fe3+-doping phosphor materials.

中文翻译：

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具有高量子效率的 Fe3+ 掺杂宽带近红外荧光粉，用于多功能 PC-LED 应用


Li3Sc2(PO4)3:Fe3+荧光粉实现了与铬离子激活材料相当的宽带近红外（NIR）发光，由于Fe3+离子的无毒性，这在环境和生物医学应用中非常理想。结构和光谱分析表明，宽带近红外发射峰值为 805 nm，半峰全宽为 130 nm，源自 Fe3+ 在 Sc3+ 位点中的非选择性双位占据。通过较大晶格畸变放宽 Fe3+ 禁禁 4T1(4G) → 6A1(6S) 跃迁的选择规则，实现了 53 %/38.7 % 的高内/外量子效率。还研究了 Fe3+ 浓度和环境温度对所制备荧光粉的宽带近红外发光性能的影响。最后制作了近红外pc-LED样机，其电光性能保证了其在无损检测和夜视方面的应用。所有结果都验证了 Li3Sc2(PO4)3 作为一种新型基质系统，可用于获得高效宽带近红外 Fe3+ 掺杂荧光粉材料。