Liu Xiaowang, Wang Yu, Li Xiyan, Yi Zhigao, Deng Renren, Liang Liangliang, Xie Xiaoji, Loong Daniel T B, Song Shuyan, Fan Dianyuan, All Angelo H, Zhang Hongjie, Huang Ling, Liu Xiaogang
Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore.
SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.
Nat Commun. 2017 Oct 12;8(1):899. doi: 10.1038/s41467-017-00916-7.
Optical characteristics of luminescent materials, such as emission profile and lifetime, play an important role in their applications in optical data storage, document security, diagnostics, and therapeutics. Lanthanide-doped upconversion nanoparticles are particularly suitable for such applications due to their inherent optical properties, including large anti-Stokes shift, distinguishable spectroscopic fingerprint, and long luminescence lifetime. However, conventional upconversion nanoparticles have a limited capacity for information storage or complexity to prevent counterfeiting. Here, we demonstrate that integration of long-lived Mn upconversion emission and relatively short-lived lanthanide upconversion emission in a particulate platform allows the generation of binary temporal codes for efficient data encoding. Precise control of the particle's structure allows the excitation feasible both under 980 and 808 nm irradiation. We find that the as-prepared Mn-doped nanoparticles are especially useful for multilevel anti-counterfeiting with high-throughput rate of authentication and without the need for complex time-gated decoding instrumentation.Luminescent materials that are capable of binary temporal coding are desirable for multilevel anti-counterfeiting. Here, the authors engineer nanoparticles that produce binary color codes on different timescales by combining the long-lived luminescence of Mn with the relatively short-lived emission of lanthanides.
发光材料的光学特性，如发射光谱和寿命，在其用于光学数据存储、文件安全、诊断和治疗等领域中发挥着重要作用。镧系元素掺杂的上转换纳米粒子由于其固有的光学性质，包括大的反斯托克斯位移、可区分的光谱指纹和长的发光寿命，特别适用于此类应用。然而，传统的上转换纳米粒子在信息存储能力方面有限，或者在防止伪造方面存在复杂性。在此，我们证明在颗粒平台中整合长寿命的锰上转换发射和相对短寿命的镧系元素上转换发射能够生成用于高效数据编码的二元时间码。对粒子结构的精确控制使得在980和808 nm照射下均可实现激发。我们发现，所制备的锰掺杂纳米粒子对于多级防伪特别有用，具有高通量认证速率且无需复杂的时间选通解码仪器。能够进行二元时间编码的发光材料对于多级防伪是很有必要的。在此，作者通过将锰的长寿命发光与镧系元素的相对短寿命发射相结合，设计出了能在不同时间尺度上产生二元颜色码的纳米粒子。
