Even though there have been significant advancements in the development of Cr3+‐activated near‐infrared (NIR) phosphors, the challenge still remains to develop highly efficient and thermally stable NIR phosphors. Here, the Ca4‐xZnxHfGe3O12:0.03Cr3+ solid solution phosphors with 834–806 nm NIR emission are constructed by substituting Zn2+ for Ca2+, thereby facilitating the formation of [ZnO6] luminescence site. The coexistence of [HfO6] and [Zn/CaO6] luminescence centers is confirmed through DFT calculation, time‐resolved photoluminescence (TRPL) spectroscopy, and low‐temperature‐photoluminescence (77 K) spectroscopy. The formation of [ZnO6] effectively resolves the issue of lattice mismatch between Cr3+ and Ca2+. Furthermore, the simultaneous enhancement of luminescence intensity and thermal stability is realized through a synergistic combination of lattice distortion and rigidity enhancement. By optimizing the substitution concentration of Cr3+, the internal quantum efficiency (IQE) of 92% and an external quantum efficiency (EQE) of 29% are finally achieved. Meanwhile, the thermal stability is also enhanced from 59%@400 K (x = 0) to 81%@400 K (x = 0.8). The developed NIR phosphor‐converted light‐emitting diodes (pc‐LEDs) exhibit promising prospects in the fields of security, biomedicine, non‐destructive testing and rapid identification.

中文翻译：

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通过晶格畸变和增强刚性的协同效应同时增强石榴石型近红外荧光粉的近红外发射和热稳定性

尽管Cr的开发取得了重大进展3+‐激活近红外（NIR）荧光粉，开发高效且热稳定的近红外荧光粉仍然面临挑战。在这里，钙4-x锌X铪锗3氧12：0.03Cr3+通过取代 Zn 构建了具有 834-806 nm 近红外发射的固溶体荧光粉2+对于钙2+，从而促进[ZnO6] 发光位点。 [HfO 共存6] 和 [Zn/CaO6] 发光中心通过 DFT 计算、时间分辨光致发光 (TRPL) 光谱和低温光致发光 (77 K) 光谱确定。 [ZnO的形成6]有效解决了Cr之间的晶格失配问题3+和钙2+。此外，通过晶格畸变和刚性增强的协同组合，实现了发光强度和热稳定性的同时增强。通过优化Cr的取代浓度3+，最终实现了92%的内量子效率（IQE）和29%的外量子效率（EQE）。同时，热稳定性也从59%@400 K (x = 0)提高到81%@400 K (x = 0.8)。所开发的近红外荧光粉转换发光二极管（pc-LED）在安全、生物医学、无损检测和快速识别等领域展现出广阔的前景。