Enhancing Photoluminescence and Stability of CsPbI3 Perovskite Quantum Dots via Cysteine Post-Processing
Enhancing Photoluminescence and Stability of CsPbI3 Perovskite Quantum Dots via Cysteine Post-Processing
复制标题
DOI：
10.3390/cryst13010045
复制
发表时间：
2022-12
期刊：
影响因子：
2.7
通讯作者：
Si-Si Chen-Si;Jianwu Wei;Q. Pang
中科院分区：
文献类型：
--
作者：
Si-Si Chen-Si;Jianwu Wei;Q. Pang
发红光的碘化铯铅（CsPbI3）钙钛矿量子点（CQD）由于其结构组成和配体在纳米晶体表面的结合力较弱而极不稳定。在此，我们报告了一种通过半胱氨酸（Cys）进行简单后处理来增强 CQD 光致发光和稳定性的有效方法。与光致发光量子产率（PLQY）为38.61%的原始CQD相比，Cys处理的CQD表面缺陷更少，获得了70.77%的PLQY，几乎是原始样品的两倍，同时，Cys处理的CQD在大气中储存20天后仍保留了86%以上的初始PL强度。该研究为高性能红光量子点的制备提供了新思路。
Red-emitting cesium lead iodide (CsPbI3) perovskite quantum dots (CQDs) are extremely unstable due to their structural composition and the weak binding force of ligands on the surface of nanocrystals. Herein, we report an effective method to enhance the photoluminescence and stability of CQDs by simple post-processing with cysteine (Cys). Compared to the pristine CQDs with a photoluminescence quantum yield (PLQY) of 38.61%, the Cys-processed one has fewer surface defects, obtaining a PLQY of 70.77%, nearly twice as much as the pristine samples, and, simultaneously, the Cys-processed CQDs retained more than 86% of the initial PL intensity after 20 days of storage in the atmosphere. This research provides a new idea for the preparation of high-performance and red-emitting quantum dots.