| 超细YF3与GdF3纳米晶的合成及其上转换发光 |
| Synthesis and Upconversion Luminescence of Ultrasmall YF3 and GdF3 Nanocrystallines |
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| 摘要: 当使用液固溶法(LSS法)制备分散性纳米晶时，将传统油酸/油酸钠/酒精反应体系中的NaOH用氨水取代时，氨水将会与油酸形成新的表面活性剂油酸铵，这样就可以合成各种超细分散性的REF3纳米晶(RE代表稀土元素)。在这种新的反应体系中，合成了平均直径小于10nm的YF3和GdF3超细颗粒，X射线与透射电镜测试表明YF3是正交相，而GdF3是面心立方结构，空间群为Fm3m，晶格常数为0.5829nm。在980nm半导体激光器激发下，可检测到YF3：Yb/Er在515~570nm处有较强的绿色发光峰、645~675nm处有较强的红色发光峰，呈橙色发光。YF3：Yb/Tm和GdF3：Yb/Tm样品在460~490nm处有较强的蓝色发光峰，而在800nm附近有更强的近红外发光峰。由于其超细的尺寸及红外上转换发光特性，合成的样品在生物成像、生物标签等方面有潜在的应用价值。 |
| 关键词: YF3/GdF3超细纳米晶 LSS法 上转换 |
| 基金项目: 国家自然科学基金(No.11274263)资助项目。 |
| Abstract: In liquid-solid-solution (LSS) method, when NaOH in the traditional oleic acid/sodium oleate/alcohol reaction system was replaced by ammonia, ammonia reacted with oleic acid, and then a new kind surfactant generated. So, this method can be used to synthesize monodispersed ultrasmall REF3 nanocrystals. In this new reaction system, ultrasmall YF3 and GdF3 nanocrystals have been synthesized. X-ray diffraction (XRD) and transmission electron microscopy (TEM) assays revealed that the as-synthesized YF3 was orthorhombic structure, but GdF3 was face-centered cubic phase (S. G.: Fm3m, lattice constant: 0.5829 nm). Under the excitation of 980 nm diode laser, strong green photoluminescence at 515~570 nm and strong red emission at 645~675 nm of YF3:Yb/Er were detected, so the luminescent color of YF3:Yb/Er nanocrystals presented orange. Intense blue emission peaks at 460~490 nm from YF3:Yb/Tm and GdF3:Yb/Tm nanocrystals were detected, especially the stronger near-infrared photoluminescence peaks near 800 nm. For the ultrasmall size and its relative strong upconversion luminescence, the as-synthesized samples show potential applications in bioimaging, biolabels and etc. |
| Keywords: YF3/GdF3 ultrasmall nanocrystals LSS method upconversion |
| 投稿时间：2013-08-20 修订日期：2013-11-27 |
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| 于锋,黄周霞,马蓦,徐昌富,林建国.超细YF3与GdF3纳米晶的合成及其上转换发光[J].无机化学学报,2014,30(4):805-810. |
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