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Research Article | Open Access

Laser-induced phase segregation of inorganic halide perovskite alloy nanowires for optical switch

Qihang Lv1,§, Xia Shen1,§ ( ), Xuyang Li1, Jianzhe Liu2, Zhaohui Shan1, Liantuan Xiao1, Pengfei Guo1( ), Johnny C. Ho3,4
College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
Huangshan Bright Semiconductor Co., Ltd., Huangshan 245021, China
Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong 999077, China
Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan

§ Qihang Lv and Xia Shen contributed equally to this work.

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Graphical Abstract

Here, we report a high-quality CsPbBr2.52I0.48 alloy nanowires by a two-step chemical vapor deposition method. These nanowires exhibit dual-wavelength emissions at 570 and 690 nm as a consequence of halide ion segregation under 375 nm laser illumination. The optical switch is reasonably designed based on the spectral intensity changes arising from phase segregation of resulting mixed-halide perovskites.

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.

Keywords

perovskite alloy nanowiresphase segregationdual-wavelength emissionoptical switchnanophotonics

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Nano Research
Volume 18 Issue 2,
February 2025
Article number: 94907119
DOI: 10.26599/NR.2025.94907119
Cite this article:
Lv Q, Shen X, Li X, et al. Laser-induced phase segregation of inorganic halide perovskite alloy nanowires for optical switch. Nano Research, 2025, 18(2): 94907119. https://doi.org/10.26599/NR.2025.94907119
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Received: 08 October 2024
Revised: 02 November 2024
Accepted: 07 November 2024
Published: 06 January 2025
© The Author(s) 2025. Published by Tsinghua University Press.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/).
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