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Ultrabright Fluorescent Polymer Dots with Thermochromic Characteristics for Full-Color Security Marking
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posted on 2019-08-05, 12:07 authored by Jyun-Chi Yang, Yu-Chieh Ho, Yang-Hsiang ChanInnovative and scalable
security technologies are in high demand
to deter increasing counterfeiting in modern society. Here, we report
the first example of thermochromic–fluorescent ink based on
semiconducting polymer dots (Pdots) by taking advantage of the unique
optical properties of Pdots. We designed and synthesized two types
of thermochromic molecules and then incorporated them with multicolor
fluorescent Pdots. The resulting Pdots exhibited colorimetric and
fluorescent dual-readout abilities in response to different temperatures
which greatly increase the security level for anticounterfeiting applications.
These multifunctional Pdots can be easily doped into flexible substrates
or prepared as inks. These full-color inks can be further loaded into
marker pens for handwriting or cartridges for inkjet printing with
excellent signal-to-background contrast. Moreover, complex and delicate
full-color images can be printed on security documents or currency
for practical use. We anticipate that this first example of thermoresponsive
dual-readout methodology based on Pdots will have broad use in advanced
security marking technologies.
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Thermochromic Characteristicsmarker pensfull-color imagesthermochromic moleculesscalable security technologiesinkjet printingsemiconducting polymer dotsmultifunctional Pdotssignal-to-background contrastdual-readout abilitiesPolymer Dotsfull-color inksanticounterfeiting applicationsthermoresponsive dual-readout methodologysecurity documentsFull-Color Security Markingsecurity level
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