@article{Lv2025, 
author = {Qihang Lv and Xia Shen and Xuyang Li and Jianzhe Liu and Zhaohui Shan and Liantuan Xiao and Pengfei Guo and Johnny C. Ho},
title = {Laser-induced phase segregation of inorganic halide perovskite alloy nanowires for optical switch},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {2},
pages = {94907119},
keywords = {nanophotonics, phase segregation, perovskite alloy nanowires, dual-wavelength emission, optical switch},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94907119},
doi = {10.26599/NR.2025.94907119},
abstract = {Inorganic perovskite nanostructures have attracted considerable attention for their tunable band gaps and excellent optoelectronic properties. It is inevitable that phase segregation of halide perovskite usually occurs in mixed-halide perovskites under a focused laser illumination, which caused by photo-induced halide-ion segregation. Here, we reported an uniform perovskite alloy nanowires via a chemical vapor deposition (CVD) method. Microstructural characterization reveals that these perovskite nanowires have independent linear morphology with high-quality crystalline. Micro-photoluminescence (PL) spectra exhibit that these nanowire structures show a dual-wavelength emissions at 690 and 570 nm, respectively. Additionally, time-dependent PL intensity of the emission peak at 690 nm is increased by the decrease of the emission peak at 570 nm under a focused laser illumination, indicating the formation of phase segregation at the excited positions. Moreover, based on these as-grown halide perovskite CsPbBr2.52I0.48 nanowires, a reasonably optical switch is designed and constructed. This optical switch may have potential applications in timed blasting system and time-delay circuit in the future.}
}