Journal
ADVANCED OPTICAL MATERIALS
Volume 6, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201701119
Keywords
broadband plasmons; fingerprint identification; flexible devices; lanthanide-doped nanocrystals; plasmonic antennas; silver nanowire network; upconversion luminescence
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Funding
- National Research Foundation of Korea (NRF) grant - Ministry of Education, Science and Technology [NRF-2016R1A2B4007209]
- National Natural Science Foundation of China [11504131, 11374127, 11504188]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- AcRF tier 2 from the Ministry of Education (Singapore) [MOE2014-T2-1-003]
- Singapore National Research Foundation [NRF-NRFF2015-02]
- Global Ph.D. Fellowship Program [NRF-2015H1A2A1033828]
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Plasmonic antennas based on metallic nanostructures that can trap long-wavelength light can be used to substantially enhance the efficiency of optoelectronic devices by utilizing light beyond the visible region. This study experimentally and theoretically demonstrates that a silver nanowire network (AgNW-net) plasmonic antenna exhibits superwide surface plasmon extinction because of the strong plasmon coupling between AgNWs, providing the ability to trap light spanning the entire solar spectrum. As a proof-of-concept demonstration, the AgNW-net is used to greatly improve the luminescence of lanthanide-doped upconversion nanocrystals (UCNCs) under dual wavelength excitation and the periodic alternating multilayer structure of AgNWs/UCNCs is further successfully introduced to improve the absolute luminescence intensity of AgNWs/UCNCs composite films. Furthermore, evidence has been provided that this improvement is attributable to excitation field enhancement rather than Purcell effect or plasmon-enhanced energy transfer. Finally, an upconversion flexible fingerprint identification technology is developed based on AgNW-net/UCNCs/polyvinyl alcohol composite materials, which allows us extracting fingerprints on various uneven bending surfaces.
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