Origin of Radioluminescence in Low-Dimensional Halide Perovskite Glass Ceramics under X-ray Excitation

Abstract

Zero-dimensional halide perovskite materials have recently shown great potential in the field of X-ray detection. Herein, Cs4PbBr6 quantum dots (QDs) glass ceramics, which can be used as scintillator materials, were fabricated by a molten salt method. The perovskite glass ceramics not only maintained the original high air stability of glass but also had high quantum yield (49.7%) and crystallinity. Not only that, QD-based solid powder exhibited strong green luminescence under the illumination of both X-ray and UV light. In addition, a novel dual emission is observed in the radioluminescence spectra of Cs4PbBr6 QDs. Electron paramagnetic resonance (EPR) and X-ray diffraction (XRD) suggested that the novel dual emission is associated with the Br vacancy. It is worth noting that after repeated X-ray irradiation, the radioluminescence (RL) intensity of the Cs4PbBr6 QDs glass ceramic sample can be increased to 6.2 times the initial intensity, which provides a new idea for the long-term repeated use of scintillator materials. These results demonstrated that Cs4PbBr6 QDs glass ceramics are promising materials in scintillator fields.

First-principles study of square chalcogen bond interactions and its adsorption behavior on silver surface

“…20 Lu's team used the fully halogenated benzene ring C 6 X 6 on the Ag(110) surface to study the interaction between halogens in self-assembly and the properties of the triangular windmill structure. 21 A search of the Cambridge Crystal Database (CSD) 22 found the crystal structures of monomers 2,1,3-benzothiadiazole (C 6 N 2 H 4 S), 23 2,1,3-benzoselenadiazole (C 6 N 2 H 4 Se) and 2,1,3benzotelluradiazole (C 6 N 2 H 4 Te) 23,24 as shown in Fig. 1.…”