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Highly Secure Plasmonic Encryption Keys Combined with Upconversion Luminescence Nanocrystals

Authors
Park, KisunPark, MinjiJang, Ho SeongPark, Ji HunKim, JaekyunCho, YounghakHan, Il KiByun, DongjinKo, Hyungduk
Issue Date
May-2018
Publisher
John Wiley & Sons Ltd.
Keywords
encryption; graphene transfer; plasmonic enhancement; upconversion
Citation
Advanced Functional Materials, v.28, no.21, pp.1 - 8
Indexed
SCIE
SCOPUS
Journal Title
Advanced Functional Materials
Volume
28
Number
21
Start Page
1
End Page
8
URI
https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/6219
DOI
10.1002/adfm.201800369
ISSN
1616-301X
Abstract
This study proposes a novel and highly secure encryption technology based on plasmonic-enhanced upconversion luminescence (UCL). The technology can be realized by a disordered plasmonic nanostructure composed of a transferred metal nanoparticle-UC nanocrystals (UCNC)-metal (tMUM) film using the graphene transfer process, in which the metal nanoparticles that formed on the graphene layer are transferred using Scotch tape. The plasmonic tMUM film strongly enhances the UCL by a factor of 200 mainly because of the excitation of the gap plasmon polaritons. Meanwhile, the UCNCs in direct contact with the metal film result in luminescence quenching caused by a nonradiative process. Herein, a highly secure anti-counterfeit film is developed, which is very hard to duplicate and cannot be reused, using two conflicting features (i.e., emission enhancement and quenching phenomena). The UCL is strongly amplified only when the first (i.e., a random metal nanoparticle array) and second (i.e., UCNCs on a Ag film) codes are very precisely overlapped as designed, thereby generating the originally designed final code. Therefore, our novel high-level security device is expected to be easily applied to protect and identify genuine products.
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COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY > DEPARTMENT OF PHOTONICS AND NANOELECTRONICS > 1. Journal Articles

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COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY (DEPARTMENT OF PHOTONICS AND NANOELECTRONICS)
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