Water-based flexographic ink with tamper detection fluorescence for security printing applications

Smart luminescent materials are widely used in anticounterfeiting for their exceptional features that are easy to authenticate, but hard to duplicate. In order to tackle authentication issues and tamper-proofing of printed documents, a new fluorophore, 2-(2-aminoethyl)− 5-hydroxy-1H-benzo[de]isoquin...

Full description

Saved in:

Bibliographic Details
Published in:	Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 653; p. 129910
Main Authors:	Muthamma, Kashmitha, Pallavi, B.E., Sunil, Dhanya, Kulkarni, Suresh D., Wagle, Shivananda, Kekuda, Dhananjaya
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 20-11-2022
Subjects:	3-Hydroxy-1,8-Naphthalimide derivative Anti-counterfeiting Penetrating fluorescence Security printing and tamper detection Water-based flexographic ink Water-based flexographic ink Penetrating fluorescence 3-Hydroxy-1,8-Naphthalimide derivative Security printing and tamper detection Anti-counterfeiting
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Smart luminescent materials are widely used in anticounterfeiting for their exceptional features that are easy to authenticate, but hard to duplicate. In order to tackle authentication issues and tamper-proofing of printed documents, a new fluorophore, 2-(2-aminoethyl)− 5-hydroxy-1H-benzo[de]isoquinoline-1,3(2H)-dione (HNEDA) was prepared as a pigment to formulate an ink with unique security features for flexographic printing. The naphthalimide-based molecule obtained through an easy one-pot synthetic procedure was structurally characterised through spectral techniques. HNEDA displayed good thermal stability and photo-physical features. The flexo prints achieved using the water-based formulation of HNEDA on a UV dull paper substrate demonstrated yellow-orange fluorescence when viewed under ultraviolet light. Moreover, secondary security features were explored through the application of various solvents, acids, and bases on the print proofs. A unique phenomenon of penetrating fluorescence on the rear side of the printed substrate, which is difficult to forge but easy to authenticate was observed. This feature provides a distinctive and secure authentication mark to detect tampering in documents/cheques/banknotes etc. Further, the surface morphology analysis, abrasion resistance, colorimetric, and densitometry studies of the prints were also investigated. Furthermore, the p-type semiconducting property and high charge carrier mobility of the prints obtained on low-cost paper substrates using the water-based ink with HNEDA as the functional pigment showcased promising opportunities in secure flexible electronics. [Display omitted] •One-pot synthesis and characterisation of HNEDA as a fluorescent pigment with good thermal and photo-physical features.•Formulation of a water-based security ink for flexography printing on paper substrate.•Unique penetrating fluorescence for tamper-detection under UV light from printed areas treated with solvents or base.
ISSN:	0927-7757 1873-4359
DOI:	10.1016/j.colsurfa.2022.129910