Hydrothermal synthesis and inkjet printing of hexagonal-phase NaYF4: Ln3+ upconversion hollow microtubes for smart anti-counterfeiting encryption†,Materials Chemistry Frontiers

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Hydrothermal synthesis and inkjet printing of hexagonal-phase NaYF4: Ln3+ upconversion hollow microtubes for smart anti-counterfeiting encryption†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-07-11 00:00:00 , DOI: 10.1039/c8qm00278a
Shaowen Xie _{1,

2,

3,

4,

5} , Chao Tong _{1,

2,

3,

4,

5} , Haihu Tan _{3,

4,

5,

6} , Na Li _{1,

2,

3,

4,

5} , Liang Gong _{1,

2,

3,

4,

5} , Jianxiong Xu _{1,

2,

3,

4,

5} , Lijian Xu _{1,

2,

3,

4,

5} , Changfan Zhang _{1,

2,

3,

4,

5}

Affiliation

Rational design and fabrication of well-defined upconversion phosphors are of great significance for anti-counterfeiting and security applications. Here, we present hydrothermal synthesis of novel upconversion hollow microtubes (UCHMs) composed of poly(acrylic acid) (PAA) functionalized hexagonal-phase NaYF₄: Ln³⁺. The resulting UCHMs possess not only well-defined structures and uniform sizes, but also strong upconversion luminescence emission at room temperature. The structure–property relationship of the NaYF₄: Ln³⁺ crystal between the phase transition from cubic to hexagonal and morphological changes from nanospheres to hollow microtubes is obtained by detailed time-dependent experiments, which help to derive a possible growth mechanism of the UCHMs. Furthermore, by doping different lanthanide ions and tailoring the molar ratio of the doped lanthanide ions in the UCHMs, three-primary-color (RGB) UCHMs are successfully produced. The RGB UCHMs are fabricated into fluorescent inks by dispersal in a solvent mixture of ethanol, water, and glycerol. The resulting RGB UCHMs inks are inkjet printed on common paper to produce hidden images under ambient conditions. However, the hidden images can be read out with red-green-blue luminescence under 980 nm light excitation. The UCHMs-based inks enable the creation of light-responsive smart encryption patterns in a secure way, and such image encryption can be spatially and selectively printed on documents for anti-counterfeiting applications.

中文翻译：

六方相NaYF ₄：Ln ³⁺上转换中空微管的水热合成和喷墨印刷，用于智能防伪加密†

定义明确的上转换磷光体的合理设计和制造对于防伪和安全应用具有重要意义。在这里，我们目前水热合成新型的上转换空心微管（UCHMs），它由聚（丙烯酸）（PAA）官能化的六角相NaYF ₄：Ln ^3+组成。所得的UCHMs不仅具有定义明确的结构和均一的尺寸，而且在室温下还具有较强的上转换发光发射。NaYF ₄：Ln ³⁺的结构-性质关系通过详细的随时间变化的实验获得了从立方到六边形的相变与从纳米球到中空微管的形态变化之间的晶体，这有助于推论UCHM的可能的生长机理。此外，通过掺杂不同的镧系元素离子并调整UCHM中掺杂的镧系元素离子的摩尔比，成功生产了三基色（RGB）UCHM。RGB UCHM通过分散在乙醇，水和甘油的溶剂混合物中制成荧光墨水。将所得的RGB UCHMs墨水喷墨打印在普通纸上，以在环境条件下产生隐藏的图像。但是，隐藏的图像可以在980 nm的光激发下用红绿蓝发光读出。

更新日期：2018-07-11

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