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Microsteganography on all inorganic perovskite micro-platelets by direct laser writing

Direct laser writing (DLW) is a mask-free and cost-efficient micro-fabrication technology, which has been explored to pattern structures on perovskites. However, there is still a lack of research on DLW methods for microsteganography. Herein, we developed a sophisticated DLW condition to pattern on...

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Bibliographic Details
Published in:Nanoscale 2021-09, Vol.13 (34), p.1445-14459
Main Authors: Sheng, Yuhang, Liu, Cihui, Yu, Liyan, Yang, Yunyi, Hu, Fengrui, Sheng, Chong, Di, Yunsong, Dong, Lifeng, Gan, Zhixing
Format: Article
Language:English
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Summary:Direct laser writing (DLW) is a mask-free and cost-efficient micro-fabrication technology, which has been explored to pattern structures on perovskites. However, there is still a lack of research on DLW methods for microsteganography. Herein, we developed a sophisticated DLW condition to pattern on CsPbBr 3 perovskite micro-platelets (MPs). In addition to the reversible PL quenching caused by photo-induced ion migration, permanent nonradiative centers are also produced by the DLW treatment. Therefore, the patterned information is retained after long-term storage. Meanwhile, the mild DLW condition only results in a faint trace, which is almost invisible under a regular optical microscope. Thus, the patterned information is hidden unless applying an excitation source, which paves the way for applications in microsteganography and anti-counterfeiting. As a proof-of-concept, different patterns are drawn on the CsPbBr 3 MPs by DLW, which are only observable under a fluorescence microscope. A sophisticated direct laser writing technique is developed to pattern on CsPbBr 3 perovskite micro-platelets for microsteganography.
ISSN:2040-3364
2040-3372
DOI:10.1039/d1nr02511b