Gasochromic fibers and inclusions for security articles

摘要

Disclosed are security articles and methods and systems for authenticating security articles using a plurality of stimuli. According to one embodiment, an illustrative secured article includes an embedded feature wherein differential activation of phosphorescent or fluorescent materials creates a machine readable response through the simultaneous presence of a source of electromagnetic radiation and a specific gas environment. A detector detects a differential spectral emission across the security feature that results from the change in gas environment. The spectral emission may be compared to an expected emissive signature to determine authenticity of the security article.

主权项

1. A secured article, comprising:
a substrate; and at least one security feature embedded in said substrate, said security feature emitting at different wavelengths when exposed to changes in gas environment, wherein the security feature emits a first spectral emission when exposed to excitation energy in a first gas environment, said first emission changing to a second spectral emission upon exposure to a change in said first gas environment.