Lanthanide-Doped Core@Multishell Nanoarchitectures: Multimodal Excitable Upconverting/Downshifting Luminescence and High-Level Anti-Counterfeiting
Lanthanide-Doped Core@Multishell Nanoarchitectures: Multimodal Excitable Upconverting/Downshifting Luminescence and High-Level Anti-Counterfeiting
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DOI：
10.1002/smll.202000708
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发表时间：
2020-04-20
期刊：
影响因子：
13.3
通讯作者：
Chen, Daqin
中科院分区：
文献类型：
--
作者：
Huang, Hai;Chen, Jiangkun;Chen, Daqin
具有并发多峰发射的发光材料的开发是提高安全性和数据存储密度的巨大挑战。镧系元素掺杂的纳米晶体由于其丰富的中间能态和可区分的光谱分布而特别适合于此类应用。然而，传统的镧系发光纳米颗粒具有有限的信息存储能力或复杂性以防止伪造。在此，它表明，在颗粒设计的镧系元素掺杂的核@多壳纳米结构中的上转换和下移发射的组合允许在宽光谱范围内产生双模态发光，用于复杂的信息存储。镧系元素掺杂剂在核和不同壳中的分布的精确控制使得能够同时激发980/808 nm聚焦/散焦激光和254 nm光，并且通过多光子能量转移过程产生来自Er、Tm、Eu和Tb的复杂上转换发射，并且通过在Gd辅助晶格中从Ce到Eu/Tb的有效能量转移产生来自Eu和Tb的下转换发射。实验证明，通过选择不同的激发模式，使用含有本核@多壳纳米晶体的丝网印刷油墨的多重可视化防伪和信息加密具有容易的解密和认证是实际适用的。
The development of luminescent materials with concurrent multimodal emissions is a great challenge to improve security and data storage density. Lanthanide-doped nanocrystals are particularly appropriate for such applications for their abundant intermediate energy states and distinguishable spectroscopic profiles. However, traditional lanthanide luminescent nanoparticles have a limited capacity for information storage or complexity to shield against counterfeiting. Herein, it is demonstrated that the combination of upconverting and downshifting emissions in a particulate designed lanthanide-doped core@multishell nanoarchitecture allows the generation of multicolor dual-modal luminescence over a wide spectral range for complex information storage. Precise control of lanthanide dopants distribution in the core and distinct shells enables simultaneous excitation of 980/808 nm focusing/defocusing laser and 254 nm light and produces complex upconverting emissions from Er, Tm, Eu, and Tb via multiphoton energy transfer processes and downshifting emissions from Eu and Tb via efficient energy transfer from Ce to Eu/Tb in Gd-assisted lattices. It is experimentally proven that multiple visualized anti-counterfeit and information encryption with facile decryption and authentication using screen-printing inks containing the present core@multishell nanocrystals are practically applicable by selecting different excitation modes.