Erasable laser 3D printing of stable perovskite CsPbBr nanocrystals in fluorophosphate glass.

In this work, perovskite CsPbBr nanocrystals (NCs) were grown using a femtosecond laser (fs) in a transparent fluorophosphate (FP) glass matrix without damage to the material. TEM images showed the formation of CsPbBr quantum dots (QDs) with sizes of 3-4 nm in the glass matrix after fs laser irradiation. Additional low-temperature treatment leads to the growth of NCs (12 nm) and the appearance of luminescence due to the annealing of defects caused by the capture of photoelectrons by the glass matrix.

Template-Assisted Synthesis of CsPbBr Nanocrystals with a Humidity-Induced Fluorescent Response: Mechanism and Sensing Applications.

Metal halide perovskites present a vast potential for the development of cutting-edge optoelectronic devices. However, their vulnerability to environmental factors, especially humidity, leads to widely acknowledged stability challenges. On the other hand, such a high sensitivity to water in the atmosphere is an opportunity for humidity sensing applications.

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

Optical data storage, information encryption, and security labeling technologies require materials that exhibit local, pronounced, and diverse modifications of their structure-dependent 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.