Metal-halide perovskites possess synthetic tunability in terms of their compositions and structures, which results in a facile control of the properties crucial for optoelectronic device applications. For instance, the optical bandgap of perovskites can be adjusted by means of halide compositions, which can generate a wide range of perovskite phases emitting visible light from purple to red. Furthermore, embedding the emissive perovskites within inorganic structural matrices provides further opportunities to tune their functionalities. In this study, we demonstrate that mechanochemical synthesis (MCS) can be successfully employed to prepare a full range of mixed-halide zero-dimensional (0D) perovskites (Cs4PbClmBr6−m and Cs4PbBr6−mIm, where m is an integer from 0 to 6). Synthesized mixed-halide 0D perovskite powder samples exhibited photoluminescence emissions spanning the entire visible spectrum (410–690 nm), which likely originates from the inclusion of three-dimensional perovskites. Furthermore, we demonstrate that our 0D perovskite powder samples can be readily used as the source for fabricating thin films via fast single-source vacuum deposition while preserving the optical properties of the source powder samples. Overall, our study reveals the versatility of MCS as a useful toolkit for preparing a family of 0D perovskites with a full range of halide compositions with potential for light-emitting applications.

Authors: Hyungbin Lim‡, Kyeong-Yoon Baek‡, Jae Il Kim, Jonghoon Lee, Jaeyoung Kim, Heebeom Ahn, Hyeonmin Choi, Seung-Je Woo, Sung Keun Lee, Tae-Woo Lee, Jeongjae Lee*, Keehoon Kang* & Takhee Lee* (‡Equally first authors, *co-corresponding authors)

DOI: https://doi.org/10.1021/acs.chemmater.3c00833

Published online: July 31, 2023

Link: https://pubs.acs.org/doi/full/10.1021/acs.chemmater.3c00833