Development of New Functional Material for anti-Clone and Authenticity Verification Technique Applicable for Ceramic Products

摘要

Multi-modal artifact metrics as an anti-counterfeiting technique is created based on the concept of multi-modal biometrics. Giving more than one characteristic information to the artifact can improve the certainty of authenticity and increase counterfeiting difficulty. To give two-optical feature information (hue and emission intensity) into ceramic products, we developed a new type of glass phosphor. It is a novel approach, because there were few reports on up-conversion phosphors having different color hue and emission intensity at each observation point on the material by infrared light excitation. By welding a small amount of phosphor powder onto the surface of ceramics, the certainty of authenticity and difficulty of counterfeiting could be enhanced than an existing method we proposed. Our study established an appropriate blending ratio of two rare earth oxides for making glass phosphor having the above-mentioned emission characteristics. These characteristics could also be seen in other glass phosphor created by different base material glass with the same blending ratio.