Mechanics Induced Triple-mode Anticounterfeiting and Moving Tactile Sensing by Simultaneously Utilizing Instantaneous and Persistent Mechanoluminescence
In this work, ultra-strong yellow and green mechanoluminescence were presented for Y3Al5O12: Ce3+ and Ba0.5Sr0.5Si2O2N2: Eu2+, respectively. In addition to the emitting color, the above materials show distinct trap dependence/independence and spontaneous radiation behaviors, leading to an instantaneous mechanoluminescence without any afterglow for Y3Al5O12: Ce3+ and a persistent mechanoluminescence for Ba0.5Sr0.5Si2O2N2: Eu2+. By ingeniously combining the above unique mechanoluminescence behaviors, two types of intriguing and unprecedented devices are achieved. They are a mechanics induced triple-mode anticounterfeiting capable of displaying the embedded information in varied emitting color and dynamic patterns, and a comprehensive tactile sensor that can simultaneously sense/record the contact load, motion trail and contact position for the objects moving on surface. This work is the first to present the application designs by simultaneously utilizing the transient and persistent mechanoluminescence, and the as-fabricated devices show unique superiority and advancement in their own fields. Particularly, the mechanoluminescence-based tactile sensor realizes the comprehensive sensing functionalities within a single unit requiring no any extra circuit design.