Liu Dongjie, Li Guogang, Dang Peipei, Zhang Qianqian, Wei Yi, Qiu Lei, Molokeev Maxim S, Lian Hongzhou, Shang Mengmeng, Lin Jun
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun, China.
University of Science and Technology of China, 230026, Hefei, China.
Light Sci Appl. 2022 Apr 27;11(1):112. doi: 10.1038/s41377-022-00803-x.
Near-infrared (NIR)-emitting phosphor-converted light-emitting diodes have attracted widespread attention in various applications based on NIR spectroscopy. Except for typical Cr-activated NIR-emitting phosphors, next-generation Cr-free NIR-emitting phosphors with high efficiency and tunable optical properties are highly desired to enrich the types of NIR luminescent materials for different application fields. Here, we report the Fe-activated SrCa(InSb)SnO phosphors that exhibit unprecedented long-wavelength NIR emission. The overall emission tuning from 885 to 1005 nm with broadened full-width at half maximum from 108 to 146 nm was realized through a crystallographic site engineering strategy. The NIR emission was significantly enhanced after complete Ca incorporation owing to the substitution-induced lower symmetry of the Fe sites. The CaInSbO:Fe phosphor peaking at 935 nm showed an ultra-high internal quantum efficiency of 87%. The as-synthesized emission-tunable phosphors demonstrated great potential for NIR spectroscopy detection. This work initiates the development of efficient Fe-activated broadband NIR-emitting phosphors and opens up a new avenue for designing NIR-emitting phosphor materials.
基于近红外光谱学，近红外（NIR）发射的磷光体转换发光二极管在各种应用中引起了广泛关注。除了典型的Cr激活近红外发射磷光体之外，人们迫切需要具有高效率和可调光学性质的下一代无Cr近红外发射磷光体，以丰富用于不同应用领域的近红外发光材料类型。在此，我们报道了Fe激活的SrCa(InSb)SnO磷光体，其表现出前所未有的长波长近红外发射。通过晶体学位点工程策略，实现了从885至1005nm的整体发射调谐，半高宽从108nm拓宽至146nm。由于取代导致Fe位点的对称性降低，在完全掺入Ca后，近红外发射显著增强。在935nm处达到峰值的CaInSbO:Fe磷光体显示出87%的超高内量子效率。所合成的发射可调谐磷光体在近红外光谱检测方面显示出巨大潜力。这项工作开启了高效Fe激活宽带近红外发射磷光体的开发，并为设计近红外发射磷光体材料开辟了一条新途径。
