  One easy-make, flexible information storage and display device is prepared.
The device show memory effect, which can record the friction trace in real time
through the triboelectric effect, and then reproduce the trajectory under the
excitation of any kind of polar liquid droplet, completely display the
triboelectric area. The explanation mechanism of this phenomenon is proposed,
and the main influencing factors of the frictional electrification between
solid materials and flexible substrates are determined by systematic
experiements. This phenomenon connects mechanoluminescence,
electroluminescence, and triboelectrification. It is of great significance to
the research of triboelectricity and mechanoluminescence, and is expected to
play an important role in display, information storage and encryption.
