Reviving aged CsPbBr3 quantum dots by triallylamine etching

• Published in: Applied surface science 2023-03, Vol.612, p.155775, Article 155775
• Main Authors: Zhang, Zhenwei, Zhang, Junkai, Zhao, Yixing, Wan, Yanli, Li, Sen, Tang, Yingwen, Li, Tao, Tian, Tingfang, Wang, Li
• Format: Article
• Language: English
• Subjects: CsPbBr3; Etching; Perovskite quantum dots; Reviving; Triallylamine
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2022.155775

[Display omitted] •Triallylamine was discovered as a liquid etchant to revive the aged CsPbBr3 QDs.•The etching removal of under-coordinated Pb ions from the aged QDs was characterized by XPS, ICP-OES, and SEM-EDS.•The aged CsPbBr3 QDs were obtained near-unity PLQY after reviving. All-inorganic halide perovskite quantum dots are widely known to suffer luminescence degradation owing to their intrinsic instability in atmospheric circumstances. Their high surface energy and weak internal ionic bonding could result in quantum dot agglomeration and structural degradation. In this work, we demonstrate that triallylamine is an efficient recovery agent to reignite the luminescence emission of aged CsPbBr3 quantum dots. The aged CsPbBr3 quantum dots re-emit bright green light instantly after triallylamine etching. The X-ray photoelectron spectroscopy results indicate a noticeable decrease of surface under-coordinated Pb ions content, leading to surface re-healing and photoluminescence quantum yields increasing. The unique emission recovery could reveal the details of CsPbBr3 quantum dot surface variety and facilitate the development of perovskite quantum dot display devices.