Abstract γ-radiation effect on structure, morphology and optical behaviour of GdVO4:RE3+/SiO2 (RE3+ = Er3+, Yb3+, Nd3+) nanophosphors has been evaluated. The synthesized products were examined by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and Photoluminescence spectra (PL). After photoexcitation of GdVO4:Er3+/SiO2, GdVO4:Yb3+/SiO2, GdVO4:Nd3+/SiO2 at 462, 487 and 532 nm, the respective rare-earth ions from phosphors emits red and NIR luminescence at 617 (2P3/2→ 4F9/2) and 690 nm (4F9/2→ 4I15/2); 640 (5F5/2→ 5I8/2) and 731 nm (5F4/2→ 5I7/2); 680 (4F9/2→ 4I9/2) and 798 nm (4F5/2→ 4I9/2). It was observed that the luminescence intensity had escalated on increasing the RE3+ content from 1 mol% to 5 mol%. Furthermore, after γ-irradiation at 150 and 300 kGy, the luminescence intensity had gone up 2–5 folds and 5–9 folds, respectively. On the other hand, the optical band gap was observed to have decreased with increasing luminescence intensity before and γ-irradiation. This enhanced red and NIR luminescence is very useful for LEDs, display and biomedical applications.

中文翻译：

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GdVO4:RE3+/SiO2 (RE = Er3+, Yb3+, Nd3+) 纳米磷光体通过 γ 辐射增强的 Vis-NIR 发光

摘要 γ 辐射对 GdVO4:RE3+/SiO2 (RE3+ = Er3+, Yb3+, Nd3+) 纳米磷光体的结构、形貌和光学行为的影响已被评估。通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和光致发光光谱（PL）对合成产物进行检测。在 GdVO4:Er3+/SiO2、GdVO4:Yb3+/SiO2、GdVO4:Nd3+/SiO2 在 462、487 和 532 nm 处光激发后，来自磷光体的相应稀土离子在 617 (2P3/2→ 4F9/ 2) 和 690 nm (4F9/2→ 4I15/2)；640 (5F5/2→ 5I8/2) 和 731 nm (5F4/2→ 5I7/2)；680 (4F9/2→ 4I9/2) 和 798 nm (4F5/2→ 4I9/2)。观察到随着 RE3+ 含量从 1 mol% 增加到 5 mol%，发光强度逐渐增加。此外，150 kGy 和 300 kGy γ 辐照后，发光强度分别增加了 2-5 倍和 5-9 倍。另一方面，观察到光学带隙随着照射前和 γ 照射的发光强度的增加而减小。这种增强的红色和 NIR 发光对于 LED、显示器和生物医学应用非常有用。