Efficient Photomodulation of Visible Eu(III) and Invisible Yb(III) Luminescences using DTE Photochromic Ligands for Optical Encryption
Efficient Photomodulation of Visible Eu(III) and Invisible Yb(III) Luminescences using DTE Photochromic Ligands for Optical Encryption
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DOI：
10.1002/adfm.202002943
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发表时间：
2020-05-28
影响因子：
19
通讯作者：
Rigaut, Stephane
中科院分区：
文献类型：
--
作者：
Al Sabea, Hassan;Norel, Lucie;Rigaut, Stephane
这项工作描述了一类组合了三个二硫乙烯单元和一个稀土离子作为光学系统的络合物，显示了一种双重加密方法：i)由于光致变色实体的变色和变色，在紫外光和可见光照射下分别绘制和擦除的彩色代码，以及ii)伴随的在相同刺激下触发的相关的稀土离子发光的逐渐消失和逐步恢复。该系统的创新之处在于发射颜色的可调性，即一种稀土离子只在可见光范围内发射(Eu3+)，或者另一种稀土离子只在近红外(NIR)范围内发射(Yb3+)，因此肉眼可见或不可见。该系统是第一个在光化学指令下实现对纯近红外发光进行高效可重复调制的系统。此外，它被证明是高效的，当它嵌入到PDMS聚合物中时，为防伪等实际应用打开了真正的机会。
This work describes a class of complex combining three dithienylethene units and a lanthanide ion used as an optical system displaying a double encryption method: i) a colorful code, drawn and erased under UV and visible irradiations respectively, due to coloration and discoloration of the photochromic entities, and ii) a concomitant gradual disappearance and progressive restoration of the associated lanthanide ion luminescence triggered with the same stimuli. The innovation of the system stems from the emission color tunability, i.e., with either a lanthanide ion emitting only in the visible range (Eu3+) or with another lanthanide ion emitting only in the near infrared (NIR) range (Yb3+), therefore observable, or not, to the naked eye. This system is the very first one to achieve efficient repeatable modulation of pure NIR luminescence on photochemical command. Furthermore, it is proven to be highly efficient when embedded in a PDMS polymer opening real opportunities for practical applications as anti-counterfeiting.