This technology, based on lanthanide chemistry, allows the development of sophisticated anti-counterfeiting systems, with 2 security levels.
Added to a polymer matrix (for instance, PMMA) or to another matrix, this photochromic system is colorless in the visible range but has a near infrared luminescence, easily detectable by a sensor at a given single wavelength.
Activation under UV light makes this photochrome emit in the blue visible range, and thus provides a second anti-counterfeiting security level, easily noticeable by eye.
Moreover, this activation suppresses luminescence, reinforcing the originality of this system.
This photochrome, exposed back to visible light, returns to its non excited state to form a fully reversible system.
The near infrared wavelength emission is customizable (ranging even to the red), allowing anti-counterfeiting systems to be taylor made and to be very difficult to copy.
UMR 6226 - ISCR
Equipe Organométalliques : Matériaux et Catalyse (OMC)
FR : 1911472 - filed on the 10-15-2019