Lanzhou Institute of Chemical Sciences and others have made progress in friction/force luminescence research

Triboluminescence, also known as mechanoluminescence, refers to a kind of luminescence phenomenon of materials under mechanical stimulation such as friction, extrusion, stretching and collision. Compared with traditional photoluminescence or electroluminescence materials, friction/force luminescence materials can use the ubiquitous mechanical energy in daily life as the excitation source, thus avoiding the need for artificial generation of light/electricity excitation sources, and are expected to be used as a new generation of energy-saving, environmental protection and sustainable light-emitting materials in lighting, display, imaging, intelligent sensing and other fields.
A few days ago, the Wang Zhaofeng 100-person plan team of the polymer tribology research group of the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, cooperated with Zhang Jiachi, associate professor of Lanzhou University, and Luyi Sun, professor of the University of Connecticut, the United States, to develop a friction/photoluminescence powder material with high brightness and polychromism - Sr3Al2O6: Eu3+/Eu2+, and composite it in the polydimethylsiloxane (PDMS) matrix, Thus, friction/force luminescence composite elastomer was obtained.
On this basis, researchers further designed and developed two kinds of friction/force luminescence flexible devices with important application value: (1) dual stimulus response anti-counterfeiting device: can hide anti-counterfeiting information in the device, and display the anti-counterfeiting information through mechanical or photon stimulation under dark conditions, with a higher anti-counterfeiting level. (2) Multi-mode tensile/strain sensor: based on the excitation wavelength selectivity of material photoluminescence and the dynamic strain response characteristics of friction/force luminescence, the device can not only sense its tensile/strain state (i.e. no tensile strain, dynamic strain and static strain), but also sense the specific strain degree of the device under the corresponding tensile state at the same time, breaking the current limit on static strain response.
The relevant results were recently published in Adv. Function. Mater., 2018, DOI: 10.1002/adfm. 201803168 by the State Key Laboratory of Solid Lubrication of Lanzhou Institute of Chemical Physics as the first research unit. This work has been supported by the Chinese Academy of Sciences and the Gansu Natural Science Foundation.

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