期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 10, 页码 12562-12570出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c25059
关键词
bilayer inverse opal photonic crystal; upconversion nanoparticles; enhanced luminescence; dual-mode structural colors; triple anticounterfeiting
资金
- National Natural Science Foundation of China [22178047, 21878042]
- Fundamental Research Funds for the Central Universities [DUT20ZD222, DUT19TD28]
- Dalian Science and Technology Innovation Fund [2020JJ26GX046]
- Dalian High-level Talents Innovation Support Program [2019RD06]
- Liaoning Revitalization Talent Program [1801006]
In this study, a bilayer inverse opal photonic crystal film with luminescent upconversion nanoparticles (M-UCNPs) was designed to achieve visible structural colors and enhanced upconversion luminescence (UCL), which enhance the anti-counterfeiting properties and possess good night vision ability.
Optical anticounterfeiting plays a vital role in information security because it can be recognized by the naked eye and is difficult to imitate. Herein, a hydrophilic modified upconversion nanoparticle (M-UCNP)-integrated bilayer inverse opal photonic crystal (IOPC) film was designed in which the luminescent M-UCNPs were deposited on the surface of the optimized bilayer structure with double photonic stop bands. The structure which can modulate light to produce structural colors can also enhance the upconversion luminescence (UCL) to improve the anticounterfeiting effect synergistically. On the one hand, the reflection colors from green to blue were observed in the specular angles on the front (540-layer) of the film. Meanwhile, the scattering colors under nonspecular angles from red to blue on the back (808-layer) appeared in the natural light. On the other hand, the bilayer structure in which the 808-layer functions as a secondary excitation source to improve the intensity of the excitation light on M-UCNPs and the 540-layer reflects the emission light of the M-UCNPs to enhance the UCL intensity endows the film with good night vision ability. Finally, the dual-mode structural colors and enhanced UCL of the patterned film work together to realize triple anticounterfeiting in banknotes.
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