Highly Secure Plasmonic Encryption Keys Combined with Upconversion Luminescence Nanocrystals
- Highly Secure Plasmonic Encryption Keys Combined with Upconversion Luminescence Nanocrystals
- 한일기; 장호성; 고형덕; 박민지; 박기선; 박지훈; 김재균; 조영학; 변동진
- encryption; upconversion; plasmonic enhancement; graphene transfer
- Issue Date
- Advanced functional materials
- VOL 28, NO 21-1800369-8
- 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 anticounterfeit 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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