journal article·2025-05-05

Ambiently Stable Two-Dimensional β-CuI Monolayers with Self-Trapping Exciton Luminescence

Bingquan Peng, Jie Jiang, Haonan Wang, Ruobing Yi, Fangfang Dai, Yinshuo Li, Lei Zhang, Zhenzhong Yang, Chang Yang, Liang Chen

ACS Materials Letters· Volume 7· Issue 5
Publisher page

Abstract

β-phase cuprous iodide (β-CuI)─a transparent p -type semiconductor with a wide bandgap and low thermal conductivity─holds promise for high-temperature electronics, flexible electrodes, light-emitting diodes (LEDs), and thermoelectrics; however, it is experimentally known only as a high-temperature phase within 645–675 K or in surface-engineered composites. Here, we report two-dimensional (2D) β-CuI monolayers prepared from γ-CuI via phase transformation and liquid-phase exfoliation. These monolayers stably exist under ambient conditions and have a hexagonal structure with a lateral size of ∼500 nm and thickness of 1 nm. Theoretical calculations indicate that the preparation of 2D β-CuI monolayers arises from low exfoliation energy along with dynamic and thermodynamic stability. Interestingly, the 2D β-CuI exhibits a unique self-trapped exciton luminescence phenomenon, emitting a broad white light spectrum close to full-spectrum illumination of sunlight. The findings represent a step toward the preparation of 2D β-CuI under ambient conditions and pave the way for the exploration of its unique properties and applications.
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Research context

OpenAlex topics: Semiconductor materials and devices · GaN-based semiconductor devices and materials · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Wenzhou Institute

University of Chinese Academy of Sciences

School of Physical Science and Technology

Ningbo University

Key Laboratory of Polar Materials and Devices (MOE), Shanghai Center of Brain-inspired Intelligent Materials and Devices, and Department of Electronics, East China Normal University, 500 Dongchuan Road, Minhang District, Shanghai 200241, China

MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics

Xi’an Jiaotong University

Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass

Zhejiang A&F University

Funding

National Key Research and Development Program of China · Ningbo University · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Startup Fund of Wenzhou Institute, University of Chinese Academy of Sciences

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