Photoinduced Transition from Quasi-Two-Dimensional Ruddlesden–Popper to Three-Dimensional Halide Perovskites for the Optical Writing of Multicolor and Light-Erasable Images

Abstract

Optical data storage, information encryption, and security labeling technologies require materials that exhibit local, pronounced, and diverse modifications of their structuredependent optical properties under external excitation. Herein, we propose and develop a novel platform relying on lead halide Ruddlesden−Popper phases that undergo a light-induced transition toward bulk perovskite and employ this phenomenon for the direct optical writing of multicolor patterns. This transition causes the weakening of quantum confinement and hence a reduction in the band gap. To extend the color gamut of photoluminescence, we use mixedhalide compositions that exhibit photoinduced halide segregation. The emission of the films can be tuned across the range of 450−600 nm. Laser irradiation provides high-resolution direct writing, whereas continuous-wave ultraviolet exposure is suitable for recording on larger scales. The luminescent images created on such films can be erased during the visualization process. This makes the proposed writing/erasing platform suitable for the manufacturing of optical data storage devices and light-erasable security labels.

Enhanced Photostability of the Colloidal Ruddlesden–Popper Perovskite Nanoplate through 4-Fluorobenzylammonium Iodide-Mediated Surface Engineering for Photoluminescent Application

“…Udalova et al emphasized the critical role of oxygen in the photodegradation of RP thin films . Anoshkin et al have recently utilized the light-induced conversion of 2D RP perovskite film into 3D phase for optical writing application . Recently, the mechanism of halide ion segregation under visible light exposure and its recovery in dark conditions have been explored for the mixed halide RP perovskite film …”