An intriguing mechanics-induced triple-mode anticounterfeiting device and a moving tactile sensor were developed by simultaneously utilizing transient and persistent mechanoluminescence.
Anticounterfeiting
is a highly required technique to protect the
product and the consumer rights in the modern society. The conventional
luminescent anticounterfeiting is based on downconversion luminescence
excited by an ultraviolet light, which is easy to be faked. In this
work, we realized six luminescent modes in a niobate-based structure
(LiNbO3:RE3+, RE3+ = Pr3+, Tm3+, Er3+, Yb3+), in which photostimulated
luminescence of LiNbO3:Pr3+, and upconversion
luminescence color evolution of LiNbO3:Er3+ were
first presented. Based on the above luminescent modes of LiNbO3:RE3+, multilevel anticounterfeiting devices were
developed. By employing mechanoluminescence and persistent luminescence,
we achieved dual-mode anticounterfeiting that could display the luminescent
patterns without any direct irradiation. In addition, another dual-mode
anticounterfeiting based on photostimulated luminescence and upconversion
luminescence excited by a near-infrared light was realized, which
could display the anticounterfeiting patterns in both static and dynamic
states. To obtain an even higher anticounterfeiting level, downconversion
luminescence, thermoluminescence, photostimulated luminescence, and
upconversion luminescence were simultaneously applied in a food trademark.
This four-mode anticounterfeiting trademark could not only show a
static–dynamic luminescence that is hard to be faked but also
allow consumers to distinguish the food freshness. The presented multilevel
anticounterfeiting strategies could be employed to resolve the counterfeit
issues in various fields.
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