This work presents an innovative screen-printed anti-counterfeiting strategy based on highly Yb3+ doped Sr/Zr hybrid oxides photothermal particles that activate thermochromic pigment. The distinctive photothermal quality can be attributed to the low thermal conductivity of host, the high amount of doping, and the low emission efficiency, the latter being verified employing a theoretical model based on rate equations. The proposed system presents a high level of security since, after several testing such as excitation at different wavelengths and powers or under a pure source of heat, decoding process is limited to only one 975 nm fixed power laser diode.
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