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Color-tuning, mirror-like encryption and selective lighting of lanthanide-based nanocellulose nanopaper for multichannel anti-counterfeiting

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Abstract

The anti-counterfeiting label with multiple fluorescent colors plays an important role in information encryption and decryption. It is urgent to develop new materials for improving the security level of secret information. In this study, novel lanthanide (Ln)-based nanopapers (Ln-nanopapers, Ln = Eu and Tb) were prepared by Ln metal–organic frameworks (Ln-MOFs) self-assembling on 2,2,6,6-tetramethylpiperidinyl-1-oxide (TEMPO) cellulose nanofibrils (tCNFs). Due to ligand energy absorption, hetero Ln-nanopapers exhibited high efficiency and brightness in characteristic luminescence and color tuning. Based on the adjusting energy absorption mode of hetero Ln-nanopapers, we selectively lit up Eu3+ (red emission) and Tb3+ (green emission) or [Eu3+ and Tb3+] (yellow emission), respectively. And, using the characteristic absorption mode of Ln3+ ions can effectively avoid the influence of fluorescent brightener on anti-counterfeiting performance. In addition, the characteristic absorption and emission spectra of Ln3+ ions were obtained by using the reversible energy level transition (7F↔ 5Dk) of Ln3+ ions, which could be used for mirror-like encryption. The Ln-nanopapers realizes the advanced anti-counterfeiting with adjustable color, selective lighting and visual recognition.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (No. 22171170, 21703131), Natural Science Basic Research Plan in Shaanxi Province of China (No. 2021JQ-555, 2022GY-279), Doctoral Scientific Research Foundation of Shaanxi University of Science & Technology (No. 2016BJ-40, 2019BJ-34), Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control (NO. 2019KF18, 2019KF33), State Key Laboratory of Biobased Material and Green Papermaking (NO. KF201918).

Funding

This work was supported by National Natural Science Foundation of China (No. 22171170, 21703131), Natural Science Basic Research Plan in Shaanxi Province of China (No. 2021JQ-555, 2022GY-279), Doctoral Scientific Research Foundation of Shaanxi University of Science & Technology (No. 2016BJ-40, 2019BJ-34), Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control (NO. 2019KF18, 2019KF33), State Key Laboratory of Biobased Material and Green Papermaking (NO. KF201918).

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by ZZ, XL, and ZZ. The frist draft of the manuscript was written by ZZ and all authors commented on previous versions of the manuscript. XD corrected grammatical errors in the manuscript. All author read and approved the final manuscript.

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Correspondence to Xinping Li, Zhao Zhang or Hui Chang.

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Zhang, Z., Li, X., Han, W. et al. Color-tuning, mirror-like encryption and selective lighting of lanthanide-based nanocellulose nanopaper for multichannel anti-counterfeiting. Cellulose 30, 9741–9756 (2023). https://doi.org/10.1007/s10570-023-05474-4

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  • DOI: https://doi.org/10.1007/s10570-023-05474-4

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