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Development of advanced optical data storage, information encryption, andsecurity labeling technologies requires low-cost materials exhibiting local,pronounced, and diverse modification of their structure-dependent opticalproperties under external excitation. Herein, for these purposes, we proposeand develop a novel platform relying on layered lead halide Ruddlesden-Popper(quasi-2D) phases that undergo a light-induced transition towards bulk (3D)halide perovskite and employ this phenomenon for the direct optical writing ofvarious multicolor patterns. This transition causes the weakening of quantumconfinement, and hence the bandgap reduction in these photoluminescent thinfilms. To significantly extend the color gamut of evolving photoluminescence,we make use of mixed-halide compositions exhibiting photoinduced halidesegregation. As a result, the emission wavelength of the resulting films can bewidely tuned across the entire 450-600 nm range depending on the illuminationconditions. We show that pulsed near-infrared femtosecond laser irradiationprovides high-resolution direct writing, whereas continuous-wave ultravioletexposure is suitable for fast recording on larger scales. The luminescentmicro- and macro-scale images created on such quasi-2D perovskite films can beerased during the visualization process, by which the persistence of theseimages to UV light exposure can be controlled and increased further with theincreasing number of octahedral layers used in the perovskite stacks. Thismakes the proposed writing/erasing perovskite-based platform suitable for themanufacturing of both inexpensive optical data storage devices andlight-erasable security labels.

Photoinduced transition from quasi-2D Ruddlesden-Popper to 3D halide perovskites for optical writing multicolor and light-erasable images