Multi-stable and erasable anti-counterfeiting technology with controlled reflection color and application thereof in optical coding

A use method of a dual erasable material system with continuous and controllable reflection color as an anti-counterfeiting material or in the field of optical information encoding,

• the dual erasable material system being composed of an intrinsic chiral diarylethene compound based on steric hindrance ethene bridge and a liquid crystal (LC) material, the intrinsic chiral diarylethene compound based on steric hindrance ethene bridge having a structure shown in formula 1o:
• and a mass ratio of the intrinsic chiral diarylethene compound based on steric hindrance ethene bridge to the LC material being in a range of 1:200 to 1:18;
• and the LC material being a nematic LC, a chiral LC, a smectic LC, a thermotropic LC, or a mixture of lamellar and columnar lyotropic LCs;
• the use method comprising:
• mixing the intrinsic chiral diarylethene compound based on steric hindrance ethene bridge and the LC material to obtain an LC mixture, and
• injecting the LC mixture in a cell to obtain the anti-counterfeiting material or a target material with optical information encoding function,
• wherein the optical information encoding function refers to realizing multi-channel encoding of light with any wavelength of 450 nm to 680 nm;
• and
• the anti-counterfeiting material undergoes reversible dual anti-counterfeiting at least twice.