Electrochromic materials change colour with an electric current and have many applications as low energy visual indicators (e.g. displays, signage, e-readers). Currently, these materials are mainly reversible. However, for security related applications (e.g. smart, anti-tampering labels), irreversible materials would be highly desirable. This innovation presents high-performing, green, manufacturing-compatible, irreversible organic electrochromic formulations.
Irreversible Organic Electrochromic Materials
Irreversible Organic Electrochromic Materials for Security and Anti-tampering Applications
By developing a high-performing, sustainable, and irreversible organic electrochromic formulation, the possible uses of electrochromic devices in security applications are hugely expanded. The material is characterized by a stark contrast between the initial, transparent state and the final coloured state, which is obtained in a very short time (i.e. < 5s) and with a very small energetic input (1.5 V). Most importantly, once the device is activated the initial transparent state can never be recovered. The innovation further comprises many other advantages such as the non-toxic and low-cost of the chromogenic material employed, and the naturally occurring dopamine molecule, enabling the production of sustainable and industrially relevant water-based formulations. Moreover, the persistence of the signal over months without the requirement of additive energetic input, further contributes to decreasing the environmental impact of this technology.
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