Silica-Based Organic–Inorganic Hybrid Fluorescent Ink for Security Applications

Abstract

A facile formulation of fast-drying fluorescent ink made from nanostructured fluorescent silica nanocrystals is presented. The rheostable viscous ink suitable for screen printing was developed by careful selection of organic vehicle components, which was later printed onto various rigid and flexible substrates. Photoluminescence studies of the printed film confirmed that the formulated ink composition did not show noticeable influence on the excitation property of the fluorescent silica. The developed cost-effective and fast-curing fluorescent silica ink with desirable luminescent property makes it a suitable candidate for information encryption, optical devices, and energy conversion applications.

Imidazolium‐Functionalized Diacetylene Amphiphiles: Strike a Lighter and Wear Polaroid Glasses to Decipher the Secret Code

“…[ 6–8 ] To this end, various security labels have been developed using organic/inorganic smart materials responding to humidity, pH, light, temperature, the electromagnetic field, or mechanical stress. [ 9–12 ]…”

Materials and Society: Functional Chemicals and Materials in Banknote and Security Paper

“…Fluorescent ink has found broad application as a security marker because of its desirable luminescent property under ultraviolet light. 19 These inks can be classified into colored fluorescent inks and colorless fluorescent inks. The appearance of colored fluorescent ink is similar to that of ordinary ink but displays special fluorescence when exposed to ultraviolet light.…”

“…Fluorescent ink has found broad application as a security marker because of its desirable luminescent property under ultraviolet light . These inks can be classified into colored fluorescent inks and colorless fluorescent inks.…”

Synthesis and performance of ZnO quantum dots water-based fluorescent ink for anti-counterfeiting applications

“…The anti-counterfeiting applications of fluorescent ink are mainly reflected in two ways. One is the display of colored fluorescence under ultraviolet light excitation 7 , 29 . The other is the fluorescence quenching and fluorescence recovery under external conditions 8 , 11 .…”