Three-Dimensional Laser Writing Aligned Perovskite Quantum Dots in Glass for Polarization-Sensitive Anti-Counterfeiting

Abstract

The pursuit of high-resolution and advanced anti-forgery technology has stimulated a growing demand for anti-counterfeiting and encryption strategies with real-time response and high security. Polarized patterns taking the advantage of high security, rapid response, simple operation, and great selectivity enable real-time and non-invasive detection by monitoring in different polarization directions. Here, a new strategy to design and fabricate the polarized CsPbBr3 quantum dot (QD) line arrays by femtosecond (fs) laser writing in a transparent glass matrix is proposed. The obtained line array structures endow isotropic CsPbBr3 QDs with macroscopic polarized emission with a polarization degree up to 0.189. Through programable design, the authors have created 2D and 3D polarized luminescent patterns made up of vertical and horizontal lines inside the glass for polarization-sensitive optical anti-counterfeiting patterns. The CsPbBr3 QD line arrays used in anti-counterfeiting can be well maintained in the water environment. The successful demonstration of the laser writing CsPbBr3 QD polarization structures in glass highlights the versatility of anti-counterfeiting and encryption.