期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 2, 期 12, 页码 2221-2227出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc32233e
关键词
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资金
- National Science Foundation/EPSCoR [0903804]
- state of the South Dakota
- National Aeronautics and Space Administration [NNX10AN34A]
- NSF [CHE 0840507, CHE 0722632]
- Center for Security Printing and Anti-Counterfeiting Technology
Recent advances in producing pre-defined 2D patterns of upconversion nanophosphors via photolithography and printing techniques present new opportunities for the use of these materials in security applications. Here, we demonstrate an RGB additive-color printing system that produces highly-resolved pre-defined patterns that are invisible under ambient lighting, but which are viewable as luminescent multi-color images under NIR excitation. Patterns are generated by independent deposition of three primary-color (red, green and blue) upconverting inks using an aerosol jet printer. The primary-color inks are printed as isolated and overlapping features to produce images that simultaneously emit red, green, blue, cyan, magenta, yellow and white upconversion luminescence. The dependence of the chromaticity of certain secondary colors (cyan and magenta) and white on NIR excitation power density can be exploited as an additional authentication feature. The development of an RGB upconversion printing system paves the way for an entirely new arena in security printing.
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