Water-based fluorescent flexo-ink for security applications

Abstract UV-readable fluorescent ink formulations find versatile applications in various fields including information encryption, automated identification systems, security markers and optical devices. In this context , a new bithiophene-based chalcone (BTCF) that exhibits good solution phase solid-state fluorescence was synthesized as colourant for formulating an eco-friendly UV ink. The molecule demonstrated thermal stability photophysical features intramolecular charge transfer, confirmed through emission studies THF–hexane mixtures with varying hexane content. intense greenish yellow displayed by BTCF exploited using it water-based formulation. Further, the used to print fast-drying solid patch on dull paper substrate flexography technique. analysis of colorimetric, densitometric rub resistance properties printed samples fluorescence, moderate photostability resistance, hence could be printing applications. Graphical abstract