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<p>A significant scientific interest has been generated in developing chemical compounds with unique properties as colourants in security inks. A pyrene-based chalcone: (E)-1-(6-methoxynaphthalen-2-yl)-3-(pyren-1-yl) prop-2-en-1-one (PYNP) with aggregation-induced enhanced emission was prepared in search of smart fluorescent pigments and was characterized using spectral techniques. Water-based flexographic ink with PYNP pigment was formulated, and coats/prints were obtained on security printing paper and paperboards. The coated and printed substrates exhibited greenish-yellow fluorescence on excitation beneath UV light. Moreover, PYNP is an effective fluorescent pigment for security printing applications, as indicated by colourimetric values, good lightfastness, gloss and abrasion resistance of the prints.</p> Graphical abstract

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Pyrene-based aggregation-induced emissive chalcone pigment in water-based flexographic ink for security printing

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • R S Bhagya,
  • Prakasha Shetty,
  • Dhanya Sunil,
  • Kashmitha Muthamma,
  • S D Kulkarni

摘要

A significant scientific interest has been generated in developing chemical compounds with unique properties as colourants in security inks. A pyrene-based chalcone: (E)-1-(6-methoxynaphthalen-2-yl)-3-(pyren-1-yl) prop-2-en-1-one (PYNP) with aggregation-induced enhanced emission was prepared in search of smart fluorescent pigments and was characterized using spectral techniques. Water-based flexographic ink with PYNP pigment was formulated, and coats/prints were obtained on security printing paper and paperboards. The coated and printed substrates exhibited greenish-yellow fluorescence on excitation beneath UV light. Moreover, PYNP is an effective fluorescent pigment for security printing applications, as indicated by colourimetric values, good lightfastness, gloss and abrasion resistance of the prints.

Graphical abstract