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Rare-Earth Doped Nanoparticles in Security Printing Applications

Published online by Cambridge University Press:  11 July 2012

William Cross ,
Tyler Blumenthal ,
Jon Kellar ,
P. Stanley May ,
Jeevan Meruga  and
QuocAnh Luu
William Cross
Affiliation:
Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph St., Rapid City, SD 57701, U.S.A.
Tyler Blumenthal
Affiliation:
Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph St., Rapid City, SD 57701, U.S.A.
Jon Kellar
Affiliation:
Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph St., Rapid City, SD 57701, U.S.A.
P. Stanley May
Affiliation:
Department of Chemistry, Churchill-Haines Laboratories, Room 115, University of South Dakota, 414 E. Clark St., Vermillion SD 57069, U.S.A.
Jeevan Meruga
Affiliation:
Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph St., Rapid City, SD 57701, U.S.A.
QuocAnh Luu
Affiliation:
Department of Chemistry, Churchill-Haines Laboratories, Room 115, University of South Dakota, 414 E. Clark St., Vermillion SD 57069, U.S.A.
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Abstract

In this work, lanthanide-doped, sodium yttrium fluoride nanocrystals were prepared and dispersed in a solvent consisting of 90 vol% toluene and 10 vol% methyl benzoate. Poly (methyl methacrylate) polymer was dissolved in the solvent, in addition to the nanocrystals. Inks were printed using direct-write techniques. Substrates used included Kapton®, bond paper, metal and glass. Stencil patterns and QR codes were printed with these inks. An overview of direct write printing for security applications is given. On many substrates, these printed traces are difficult to detect in ambient lighting, but can be easily read using near-infrared (NIR) illumination, making them very useful for covert and semi-covert security printing applications.

Keywords

lanthanidescreen printingpolymer
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1471: Symposium YY – Rare-Earth-Based Materials , 2012 , mrss12-1471-yy09-03
Copyright
Copyright © Materials Research Society 2012

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References

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