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一锅法制备Cs3Cu2I5钙钛矿纳米晶及其X射线成像应用

苏都那1, 胡晓博1,2, 吴传丽1,2, 马景盛1, 王连军3, 江莞3, 韩修训1,2   

  1. 1.江西理工大学 材料科学与工程学院,赣州 341000;
    2.国家稀土功能材料创新中心, 赣州 341001;
    3.东华大学 材料科学与工程学院, 上海 201620
  • 收稿日期:2026-02-07 修回日期:2026-03-05
  • 通讯作者: 胡晓博, 博士. E-mail: xbhu@jxust.edu.cn; 韩修训, 教授. E-mail: xxhan@jxust.edu.cn.
  • 作者简介:苏都那(1999-), 男, 研究生. E-mail: SDN20251216@163.com
  • 基金资助:
    国家自然科学基金(52402188), 江西省自然科学基金(20242BAB20168, 20244BCE52192, 20232BAB213008,20242BAB26058), 江西省赣州市创新人才计划项目(2022CXRC9294), 江西理工大学博士科研启动项目(205200100684).

One-pot Preparation of Cs3Cu2I5 Perovskite Nanocrystals and Their Application in X-ray Imaging

SU Duna1, HU Xiaobo1,2, WU Chuanli1,2, MA Jingsheng1, WANG Lianjun3, JIANG Wan3, HAN Xiuxun1,2   

  1. 1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
    2. National Rare Earth Function Materials Innovation Center, Ganzhou 341000, China;
    3. College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
  • Received:2026-02-07 Revised:2026-03-05
  • Contact: HU Xiaobo, PhD. E-mail: xbhu@jxust.edu.cn; HAN Xiuxun, professor, E-mail: xxhan@jxust.edu.cn.
  • About author:SU Duan (1999-), male, Master candidate. E-mail: SDN20251216@163.com
  • Supported by:
    National Natural Science Foundation of China (52402188), Natural Science Foundation of Jiangxi Province (20242BAB20168, 20244BCE52192, 20232BAB213008, 20242BAB26058), Innovative Talents Program of Ganzhou (2022CXRC9294), and Scientific Research Foundation of Jiangxi University of Science and Technology (205200100684)

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摘要： 全无机Cs3Cu2I5钙钛矿具有无铅特性、高发光效率及独特的自陷激子(STE)发光性质,是极具潜力的X射线成像材料,然而如何实现其纳米晶形态的高效可控制备与性能调控仍然面临挑战。本研究发展了一种简便的一锅法合成策略,通过系统优化Cs/Cu比例与油酸(OA)/油胺(OAm)双重配体浓度,成功制备出高结晶度、高发光效率及高稳定性的Cs3Cu2I5纳米晶,并评估其作为闪烁体材料在X射线成像中的应用潜力。Cs/Cu摩尔比为0.67 : 1时有利于形成纯相Cs3Cu2I5纳米晶,配体浓度为650 mmol/L时可以促进OA和OAm有效钝化纳米晶的表面缺陷、抑制非辐射复合,合成的Cs3Cu2I5纳米晶光致发光量子产率(PLQY)高达83%,且在室温环境下储存35 d后,其发光强度仍能保持初始值的90%以上,展现出优异的发光性能和卓越的环境稳定性。基于Cs3Cu2I5纳米晶与柔性聚二甲基硅氧烷(PDMS)构筑的复合薄膜具备良好的闪烁性能,光产额达到14019 ph/MeV,探测限低至1.3 μGyair/s,实现了12 lp/mm的空间分辨率,可以获得清晰的X射线成像照片。本研究为高性能X射线成像无铅钙钛矿纳米晶闪烁体的高效制备和性能调控提供了参考。

关键词: 钙钛矿纳米晶, 闪烁体, Cs3Cu2I5, 发光强度, 稳定性

Abstract: Zero-dimensional all-inorganic Cs3Cu2I5 perovskite emerges as a highly promising X-ray imaging material due to its lead-free nature, high luminescence efficiency, and unique photophysical properties originating from self-trapped excitons (STE). However, achieving the efficient, controllable synthesis and performance optimization of its nanocrystalline form remains a significant challenge. This study developed a facile one-pot synthesis strategy, aiming to fabricate Cs3Cu2I5 perovskite nanocrystals with high crystallinity, high luminescence efficiency, and excellent stability by synergistically optimizing the Cs/Cu molar ratio and the concentration of the oleic acid (OA)/oleylamine (OAm) dual-ligand system. The potential of these nanocrystals as scintillators for X-ray imaging was subsequently evaluated. The Cs/Cu molar ratio of 0.67 : 1 facilitates the formation of pure-phase Cs3Cu2I5 nanocrystals. A ligand concentration of 650 mmol/L promotes the effective passivation of surface defects by OA and OAm, thereby suppressing non-radiative recombination. The synthesized Cs3Cu2I5 nanocrystals exhibit outstanding optical properties, including a photoluminescence quantum yield (PLQY) as high as 83%. Remarkably, they retain over 90% of initial photoluminescence intensity after 35 d of storage under ambient conditions, demonstrating superior environmental stability. The composite film constructed from Cs3Cu2I5 nanocrystals and polydimethylsiloxane (PDMS) shows promising scintillation performance, with a light yield of 14019 ph/MeV, a detection limit as low as 1.3 μGyₐᵢᵣ/s. Furthermore, a spatial resolution of 12 lp/mm is achieved, enabling the acquisition of clear X-ray imaging photographs. This work provides a valuable reference for the efficient preparation and performance regulation of high-performance, lead-free perovskite nanocrystals scintillators for next-generation X-ray imaging devices.

Key words: perovskite nanocrystals, scintillator, Cs3Cu2I5, luminescence intensity, stability

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