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首页> 外文期刊>Journal of Materials Science >Ionic liquid-based synthesis of luminescent YVO4:Eu and YVO4:Eu@YF3 nanocrystals
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Ionic liquid-based synthesis of luminescent YVO4:Eu and YVO4:Eu@YF3 nanocrystals

机译：离子液体的发光YVO 4 ：Eu和YVO 4 ：Eu @ YF 3 纳米晶体的合成

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Luminescent YVO4:Eu nanocrystals were prepared via an ionic liquid-based synthesis. According to electron microscopy, dynamic light scattering, and X-ray diffraction, the presence of uniform and highly crystalline particles, 12–15 in diameter is validated. As-prepared particles turn out to be nonagglomerated and redispersible. Photoluminescence exhibits characteristic red emission related to Eu3+. Quantum yield of as-prepared YVO4:Eu (15 mol%) is determined to 17–19%. The quantum yield of as-prepared material increases to 44–46% by establishing an YVO4:Eu@YF3 core-shell structure. Since the lattice planes (001) of YVO4 and (100) of YF3 match very well, a crystalline YF3 shell, 1–2 nm in thickness protects the YVO4 core very efficiently. Besides the significantly increased quantum yield, the presence of a core-shell structure is further evidenced by electron energy loss spectroscopy. Element mapping revealed high intensities of Eu in the inner parts, associated with low peripheral fluorine intensities.
机译：发光YVO 4 ：Eu纳米晶体是通过基于离子液体的合成制备的。根据电子显微镜，动态光散射和X射线衍射，可以确认存在直径12–15的均匀且高度结晶的颗粒。所制备的颗粒证明是不团聚和可再分散的。光致发光表现出与Eu 3 + 有关的特征性红色发射。制备的YVO 4 ：Eu（15 mol％）的量子产率确定为17–19％。通过建立YVO 4 ：Eu @ YF 3 核-壳结构，所制备材料的量子产率提高到44-46％。由于YVO 4 的晶格面（001）和YF 3 的晶格面（100）很好地匹配，因此，晶体YF 3 的壳为1– 2 nm的厚度非常有效地保护了YVO 4 磁芯。除了显着增加的量子产率外，电子能量损失谱进一步证明了核-壳结构的存在。元素图谱显示内部的Eu强度高，周围的氟强度低。

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