Nie Mengxiang, Zhu Xiaolin, Jiang Shengjie, Xie Qingyu, Luo Long, Zhao Liang, Zhou Min, Wu Daofu, Tang Xiaosheng, Wang Jia, Tian Shengnan, Liu Yongfeng
College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, China.
College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, China; Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, PR China.
J Colloid Interface Sci. 2025 Dec 15;700(Pt 1):138350. doi: 10.1016/j.jcis.2025.138350. Epub 2025 Jul 3.
Halide perovskite quantum dots (PeQDs) have garnered significant attention for their exceptional optoelectronic properties, particularly in light-emitting diode (LED) applications. However, their susceptibility to thermal degradation at elevated temperatures (>100 °C) poses a critical barrier to commercialization. In this study, we address this challenge through a synergistic ZnF post-treatment strategy applied to CsPbBr PeQDs. Comprehensive experimental characterizations and density functional theory (DFT) calculations reveal that the ZnF treatment induces the formation of a dual-shell structure: CsPbBr: F inner shell and a zinc-rich outer shell chemically that bonds with Br and F ions from the CsPbBr: F layer. The inner shell primarily suppresses thermal degradation, while both shells collaboratively mitigate surface defects. This dual-shell engineering endows the CsPbBr PeQDs with remarkable thermal stability, maintaining their optical properties and crystallinity even after heating at 120 °C for 60 min, alongside achieving near-unity photoluminescent quantum yield. Furthermore, the dual-shell PeQDs exhibit a 24-fold enhancement in device lifespan in electroluminescent LEDs and superior operational stability in photoluminescent white LEDs. This work offers a simple yet highly effective approach to fabricating thermally stable PeQDs, paving the way for their practical application in next-generation optoelectronic devices.
卤化物钙钛矿量子点（PeQDs）因其优异的光电特性而备受关注，尤其是在发光二极管（LED）应用方面。然而，它们在高温（>100°C）下易受热降解，这对商业化构成了关键障碍。在本研究中，我们通过应用于CsPbBr PeQDs的协同ZnF后处理策略来应对这一挑战。全面的实验表征和密度泛函理论（DFT）计算表明，ZnF处理诱导形成了双壳结构：CsPbBr:F内壳层和富含锌的外壳层，外壳层与CsPbBr:F层中的Br和F离子发生化学键合。内壳层主要抑制热降解，而两层壳协同减轻表面缺陷。这种双壳工程赋予了CsPbBr PeQDs显著的热稳定性，即使在120°C加热60分钟后仍能保持其光学性质和结晶度，同时实现了近乎单位的光致发光量子产率。此外，双壳PeQDs在电致发光LED中的器件寿命提高了24倍，在光致发光白色LED中具有卓越的运行稳定性。这项工作提供了一种简单而高效的方法来制备热稳定的PeQDs，为其在下一代光电器件中的实际应用铺平了道路。
