Inkjet printing of upconversion nanoparticles for anti-counterfeit applications

Patterning of upconversion luminescent materials has been widely used for anti-counterfeit and security applications, where the preferred method should be easy, fast, multicolor, high-throughput and designable. However, conventional patterning methods are complex and inflexible. Here, we report a di...

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Bibliographic Details
Published in:Nanoscale 2015-03, Vol.7 (10), p.4423-4431
Main Authors: You, Minli, Zhong, Junjie, Hong, Yuan, Duan, Zhenfeng, Lin, Min, Xu, Feng
Format: Article
Language:English
Subjects:
Excitation
Inkjet printing
Lasers
Luminescence
Multilayers
Nanoparticles
Optimization
Patterning
Upconversion
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Summary:Patterning of upconversion luminescent materials has been widely used for anti-counterfeit and security applications, where the preferred method should be easy, fast, multicolor, high-throughput and designable. However, conventional patterning methods are complex and inflexible. Here, we report a digital and flexible inkjet printing based approach for producing high-resolution and high-luminescence anti-counterfeit patterns. We successfully printed different multicolor luminescent patterns by inkjet printing of upconversion nanoparticles with controlled and uniform luminescence intensity through optimizing the inks and substrates. Combined with another downconversion luminescent material, we achieved two different patterns in the same area, which show up separately under excitation by different wavelength laser sources. The developed technology is promising to use one single substrate for carrying abundant information by printing multilayer patterns composed of luminescent materials with different excitation light sources.
ISSN:2040-3364
2040-3372
DOI:10.1039/c4nr06944g