Liu Dongjie, Li Guogang, Dang Peipei, Zhang Qianqian, Wei Yi, Qiu Lei, Lian Hongzhou, Shang Mengmeng, Lin Jun
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China.
Light Sci Appl. 2023 Oct 7;12(1):248. doi: 10.1038/s41377-023-01283-3.
Achievement of high photoluminescence quantum efficiency and thermal stability is challenging for near-infrared (NIR)-emitting phosphors. Here, we designed a "kill two birds with one stone" strategy to simultaneously improve quantum efficiency and thermal stability of the NIR-emitting CaY(ZnZr)GeO:Cr garnet system by chemical unit cosubstitution, and revealed universal structure-property relationship and the luminescence optimization mechanism. The cosubstitution of [Zn-Zr] for [Y-Y] played a critical role as reductant to promote the valence transformation from Cr to Cr, resulting from the reconstruction of octahedral sites for Cr. The introduction of [Zn-Zr] unit also contributed to a rigid crystal structure. These two aspects together realized the high internal quantum efficiency of 96% and excellent thermal stability of 89%@423 K. Moreover, information encryption with "burning after reading" was achieved based on different chemical resistance of the phosphors to acid. The developed NIR-emitting phosphor-converted light-emitting diode demonstrated promising applications in bio-tissue imaging and night vision. This work provides a new perspective for developing high-performance NIR-emitting phosphor materials.
对于近红外（NIR）发光磷光体而言，实现高光致发光量子效率和热稳定性具有挑战性。在此，我们设计了一种“一石二鸟”策略，通过化学单元共取代同时提高NIR发光CaY(ZnZr)GeO:Cr石榴石体系的量子效率和热稳定性，并揭示了通用的结构-性能关系和发光优化机制。[Zn-Zr]对[Y-Y]的共取代作为还原剂起到了关键作用，促进了Cr从Cr的价态转变，这是由于Cr的八面体位置重构所致。[Zn-Zr]单元的引入也有助于形成刚性晶体结构。这两个方面共同实现了96%的高内量子效率和423 K下89%的优异热稳定性。此外，基于磷光体对酸的不同化学抗性，实现了“阅后即焚”的信息加密。所开发的近红外发光磷光体转换发光二极管在生物组织成像和夜视方面显示出有前景的应用。这项工作为开发高性能近红外发光磷光体材料提供了新的视角。
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