Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 38, Pages 9477-9484Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201800715
Keywords
materials science; nanophosphors; nanotaggants; photoluminescence; security paper
Categories
Funding
- University Grant Commission (UGC), Government of India
- DST, Government of India
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Increasing counterfeiting of important data, currency, stamp papers, branded products etc., has become a major security threat which could lead to serious damage to the global economy. Consequences of such damage are compelling for researchers to develop new high-end security features to address full-proof solutions. Herein, we report a dual mode flexible highly luminescent white security paper and nanotaggants composed of nanophosphors incorporated in polymer matrix to form a nanofiber-based mat for anti-counterfeiting applications. The dual mode nanofibers are fabricated by electrospinning technique by admixing the composite of NaYF4:Eu3+@NaYF4:Yb3+, Er3+ nanophosphors in the polyvinyl alcohol solution. This flexible polymer mat derived from nanofibers appears white in daylight, while emitting strong red (NaYF4:Eu3+) and green (NaYF4:Yb3+, Er3+) colors at excitation wavelengths of 254 nm and 980 nm, respectively. These luminescent nanofibers can also be encrypted as a new class of nanotaggants to protect confidential documents. These obtained results suggest that highly luminescent dual mode polymeric nanofiber-based flexible white security paper and nanotaggants could offer next-generation high-end unique security features against counterfeiting.
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