Controlled synthesis, formation mechanism and upconversion luminescence of NaYF4: Yb, Er nano-/submicrocrystals via ionothermal approach

Controlled synthesis, formation mechanism and upconversion luminescence of NaYF4: Yb, Er nano-/submicrocrystals via ionothermal approach
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通过电离热方法控制 NaYF4: Yb, Er 纳米/亚微晶的合成、形成机制和上转换发光

DOI:
10.1016/j.jssc.2012.01.058
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发表时间:
2012-06
影响因子:
3.3
通讯作者:
Zhang, Hong
Zhang, Hong
中科院分区:
化学3区
文献类型:
--
作者:
Liu, Jia;Liu, Xiaomin;Kong, Xiangui;Zhang, Hong

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为了加深对离子液体([EMIM][BF4],[BMIM][BF4]和[OMIM][BF4])合成纳米/亚微结构的基本认识,我们利用亲水性离子液体[[EMIM][BF4]和[OMIM][BF4])作为溶剂、模板和氟源,合成了稀土掺杂的NaYF4上转换纳米/亚微晶(UC-NMC)。咪唑正离子提供了封闭剂,防止了成核中心的聚集和生长,而四氟硼酸根离子通过部分水解引入了一个新的氟源。结果表明,离子液体的粘度、极性、溶解性和界面张力等性质对稀土离子在离子液体中的溶解、扩散和成核过程有很大影响。因此,最终产品的形态和大小可以通过综合参数来定制,如咪唑阳离子、助溶剂、Ln3+和氟化物的浓度,以及离子热时间。根据实验结果,讨论了UC-NMCs在IL中成核和生长的可能机制。
In order to deepen the fundamental understanding of IL-mediated synthesis of nano-/submicrostructure, hydrophilic ILs ([Emim][BF4], [Bmim][BF4] and [Omim][BF4]), which act as solvents, templates, as well as fluorine source, have been employed to synthesize rare earth doped NaYF4upconversion nano-/submicrocrystals (UC-NMCs). The imidazolium cations provide the capping reagent to prevent the nucleation centers from aggregation and growing, while the tetrafluoroborate anions introduce a new fluorine source according to partial hydrolysis. It is demonstrated that the properties of IL, such as viscosity, polarity, solvency and interfacial tension, extremely affect the dissolution, diffusion and nucleation process of lanthanide ions in IL. Morphology and size of the final products can thus be tailored by synthetical parameters, like imidazolium cations, cosolvents, Ln3+and fluoride concentrations, as well as ionothermal time. Based on the experimental results, the possible mechanism of the nucleation and growth of UC-NMCs in IL is discussed.
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