A general method to NaLnF4 assemblies with ordered structures and strong emissions
A general method to NaLnF4 assemblies with ordered structures and strong emissions
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DOI：
10.1016/j.matlet.2011.07.101
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发表时间：
2011-12
影响因子：
3
通讯作者：
Zeye Wang;Limin Wang;Zhengquan Li
中科院分区：
文献类型：
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作者：
Zeye Wang;Limin Wang;Zhengquan Li
镧系氟化钠（NaLnF4）具有光子能量低、折射率高、光学稳定性好等优点，是一种重要的发光材料。nalnf4晶体的纳米结构已经通过各种方法被开发出来。然而，迄今为止，具有有序结构的组装nalnf4纳米晶体仍然很少。在这里，我们展示了一种简单的方法来制备NaLnF4（Ln=Ce, Eu, Tm， Y）组件，该组件由具有有序结构的小NaLnF4纳米晶体组成。有趣的是，单个组装中的小nalnf4纳米晶体彼此紧密相连，并沿同一方向定向。光谱调查显示，这些组件具有强烈的上下转换发射。本文还提出了这些新组合物形成的可能机制。
Sodium lanthanide fluorides (NaLnF4) are important luminescent materials due to their low-photon energies, high refractive indexes and excellent optical stabilities. Nanostructures of NaLnF4crystals have been developed using a variety of methods. However, assembled NaLnF4nanocrystals with ordered structures are still rarely obtained to date. Herein, we demonstrate a facile method to prepare NaLnF4(Ln=Ce, Eu, Tm, Y) assemblies comprising of small NaLnF4nanocrystals with an ordered structure. Interestingly, small NaLnF4nanocrystals within a single assembly are tightly attached to one another and orientated along the same direction. Spectral investigation revealed strong down- and up-conversion emissions from these assemblies. A possible mechanism on the formation of these novel assemblies is also proposed here.