MIIT Key Laboratory of Advanced Display Material and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China.
State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Key Laboratory of Excited State Materials of Zhejiang Province, Hangzhou, Zhejiang 310027, China.
J Phys Chem Lett. 2022 Apr 7;13(13):2862-2870. doi: 10.1021/acs.jpclett.2c00456. Epub 2022 Mar 24.
CsCuI nanocrystals (NCs) are considered to be promising materials due to their high photoluminescence efficiency and X-ray hardness. However, the present strategy depends on tedious fabrication with excessive chemical waste. The evasive iodide ion dissociation, inadaptable ligand system, low stability, and relatively low light yield severely impede their applications. Herein, we develop an in situ fabrication strategy for a flexible and large-area Tl-doped CsCuI NC-polymer composite scintillation film with a high light yield (∼48800 photons/MeV) and improved stability. Tween 80 and phosphinic acid successfully inhibit the oxidation of iodide ions, and the films can be stored for at least six months. As a result, a high spatial resolution of 16.3 lp mm and a low detection limit of 305 nGy s were achieved. A radioluminescence intensity of >80% was maintained after a total irradiation dose of 604.8 Gy. These results indicate the promising application of these copper halide NCs in low-cost, flexible, and high-performance medical imaging.
CsCuI 纳米晶体 (NCs) 由于其高光致发光效率和 X 射线硬度而被认为是很有前途的材料。然而，目前的策略依赖于繁琐的制造工艺和过量的化学废物。难以避免的碘化物离子离解、不适应的配体系统、低稳定性和相对较低的光产率严重阻碍了它们的应用。在此，我们开发了一种原位制备策略，用于制备具有高光产率（约 48800 个光子/MeV）和改善的稳定性的柔性和大面积 Tl 掺杂 CsCuI NC-聚合物复合闪烁膜。吐温 80 和膦酸成功抑制了碘化物离子的氧化，并且这些薄膜可以至少储存六个月。因此，实现了 16.3 lp mm 的高空间分辨率和 305 nGy s 的低检测限。在总辐照剂量为 604.8 Gy 后，仍保持 >80%的发光强度。这些结果表明这些铜卤化物 NCs 在低成本、柔性和高性能医学成像方面有很有前途的应用。
