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Research Article | Open Access

15.13% Sr-doped CsPbI3 quantum dots with near-unity quantum yield via surface ligand compensation

Yi Peng, Wanzhong Gu, Yuhui Dong (), Yucong Ji, Danni Yan, Ziyun Lin, Li Zhang, Yousheng Zou (), Haibo Zeng ()
MIIT Key Laboratory of Advanced Display Materials and Devices, Jiangsu Province Engineering Research Center of Quantum Dot Display, School of Materials Science and Engineering, Institute of Optoelectronics and Nanomaterials, Nanjing University of Science and Technology, Nanjing 210094, China
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In this work, we developed a fine purification strategy to resolve the contradiction between environmental friendliness and optical performance. This strategy enabled the synthesis of CsPbI3 quantum dots (QDs) with near-unity photoluminescence quantum yield (PLQY) at Sr/Pb ratios up to 15.13%. The enhancement of PLQY is due to the I ions provided by the oleylammonium iodide (OAmI) ligand effectively compensating for the I vacancies on the surface of QDs. Furthermore, fine purification strategy enhances the stability of the doped QDs. This will further promote the preparation and application of low-lead or lead-free QDs with superior properties.

Abstract

Sr-doping of perovskite quantum dots (QDs) is a promising strategy to reduce Pb content and improve optical performance and stability. However, excessive Sr introduces new defects that degrade photoluminescence quantum yield (PLQY). Therefore, it is a challenge to balance high optical performance with high doping concentration for the preparation of environmentally friendly perovskite QDs. In this study, we report the highest Sr/Pb ratios Sr-doped CsPbI3 QDs (15.13%) with a near-unity PLQY. The balance between high PLQY and high Sr-doping rate is achieved through the introduction of oleylammonium iodide (OAmI) ligand compensation during the anti-solvent purification process, which can form an iodine-enriched environment and effectively passivates the surface defects of QDs caused by excessive Sr-doping. Moreover, the Sr-doped CsPbI3 QDs exhibit superior stability in environments with high temperature and humidity or direct contact with water. This strategy provides a novel approach for the preparation of lead-less and lead-free QDs with superior optical performance and stability, offering a potential solution for environmentally friendly applications.

Keywords

CsPbI3 quantum dotsSr-dopingligand compensationphotoluminescence quantum yieldenvironmental stability

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Nano Research
Volume 18 Issue 4,
April 2025
Article number: 94907257
DOI: 10.26599/NR.2025.94907257
Cite this article:
Peng Y, Gu W, Dong Y, et al. 15.13% Sr-doped CsPbI3 quantum dots with near-unity quantum yield via surface ligand compensation. Nano Research, 2025, 18(4): 94907257. https://doi.org/10.26599/NR.2025.94907257
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