Erasable glass-stabilized perovskite quantum dots for NIR-laser-stimuli-responsive optical security

Stimuli-responsive smart luminescent materials capable of dynamic color emission with distinct spectral profile/intensity are highly desirable for anti-counterfeiting applications. Here, we report the dynamic manipulation of photoluminescence from metal halide CsPbX 3 (X = Br, I) perovskite quantum dots (PeQDs) inside a glass medium by tuning local temperature fields in real time in combination with the efficient photothermal material CsYb 2 F 7 @glass. Benefiting from the effective protection of the inorganic glass matrix and low exciton binding energy of PeQDs, it is feasible to realize stable and reversible ON/OFF full-spectral emissions of PeQDs upon commercial 980 nm laser stimulation. The dynamic combination of downshifting PeQDs and upconverting lanthanide-doped CsYb 2 F 7 can be elaborately designed to produce a series of erasable photochromic anti-counterfeiting patterns and multi-dimensional optical encodings. • An approach to dynamically manipulate PL of CsPbX 3 QDs inside glass is developed • Laser-induced Ln 3+ photothermal effect is used to lighten/quench PL of CsPbX 3 @glass • Erasable photochromic anti-counterfeiting and optical encodings are demonstrated Wang et al. demonstrate the dynamic manipulation of erasable emissions from CsPbX 3 perovskite quantum dots (PeQDs) inside a glass medium by tuning local temperature fields in real time with the help of the efficient photothermal material CsYb 2 F 7 . This controllable combination of rare-earth/PeQDs may enable their practical application in high-level optical security.