Unclonable Security Codes Designed from Multicolor Luminescent Lanthanide-Doped Y2O3 Nanorods for Anticounterfeiting
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Unclonable Security Codes Designed from Multicolor Luminescent Lanthanide-Doped Y2O3 Nanorods for Anticounterfeiting
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| Creator |
Kumar, Pawan
Nagpal, Kanika Gupta, Bipin Kumar |
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| Subject |
Materials Science
Nanoscience/ Nanotechnology |
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| Description |
The duplicity of important docurnenti-has emerged as a Serious problem worldwide. Therefore, many efforts have been devoted to developing easy and fast anticounterfeiting techniques with multicolor emission. Herein, we report the synthesis of multicolor luminescent lanthanide-doped Y2O3 nanorods by hydrothermal method and their usability in designing of unclonable security codes for anticounterfeiting applications. The spectroscopic features of nanorods are probed by photoluminescence spectroscopy. The Y2O3:Eu3+, Y2O3:Tb3+, and Y2O3:Ce3+ nanorods emit hypersensitive red (at 611 nm), strong green (at 541 nm), and bright blue (at 438 nm) emissions at 2.54, 305, and 381 nm, respectively. The SEM and TEM/HRTEM results reveal that these nanorods have diameter and length in the range of 80-120 nm and similar to 2-5 mu m, respectively. The two-dimensional spatially resolved photolumipescence intensity distribution in nanorods is also investigated by using confocal photoluminescence microscopic technique. Further, highly luminescent unclonable security codes are printed by a simple screen printing technique using-luminescent ink fabricated from admixing of lanthanide doped multicolor nanorods in PVC medium. The prospective use of these multicolor luminescent nanorods provide a new opportunity for easily printable, highly stable, and unclonable multicolor luminescent security codes for anti-counterfeiting applications.
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| Publisher |
American Chemical Society
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| Date |
2017-04-26
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/2921/1/Unclonable%20Security%20Codes%20Designed.pdf
Kumar, Pawan and Nagpal, Kanika and Gupta, Bipin Kumar (2017) Unclonable Security Codes Designed from Multicolor Luminescent Lanthanide-Doped Y2O3 Nanorods for Anticounterfeiting. ACS Applied Materials and Interfaces, 9 (16). pp. 14301-14308. ISSN 1944-8244 |
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| Relation |
http://npl.csircentral.net/2921/
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