TY - JOUR
T1 - Highly Secure Plasmonic Encryption Keys Combined with Upconversion Luminescence Nanocrystals
AU - Park, Kisun
AU - Park, Minji
AU - Jang, Ho Seong
AU - Park, Ji Hun
AU - Kim, Jaekyun
AU - Cho, Younghak
AU - Han, Il Ki
AU - Byun, Dongjin
AU - Ko, Hyungduk
N1 - Funding Information:
This research was financially supported by the National Research Foundation of Korea (Grant Nos. NRF-2013M3C1A3065040 and
Funding Information:
NRF-2017M1A2A2048904), the Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP grant; Grant No. 20153030012870), and the KIST Institutional Research Program (Grant No. 2E26970).
PY - 2018/5/24
Y1 - 2018/5/24
N2 - 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.
AB - 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.
KW - encryption
KW - graphene transfer
KW - plasmonic enhancement
KW - upconversion
UR - http://www.scopus.com/inward/record.url?scp=85045411231&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85045411231&partnerID=8YFLogxK
U2 - 10.1002/adfm.201800369
DO - 10.1002/adfm.201800369
M3 - Article
AN - SCOPUS:85045411231
VL - 28
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 21
M1 - 1800369
ER -