Highlights

• This paper introduces aluminium self-passivation as a simple way to improve the photostability of CuInS₂@ZnS core@shell quantum dots.
• Aluminium in the ZnS shell oxidizes into an Al₂O₃-like protective layer, turning surface oxidation from a degradation problem into a stabilizing mechanism.
• The work establishes a key principle for the cluster: fragile quantum dots can be protected from within their shell without sacrificing luminescence.

Summary

This study marks an early milestone in Professor Liang Li’s long-term effort to make quantum dots more durable. Conventional quantum dots often lose performance under light exposure because their surfaces are vulnerable to oxidation and environmental attack. By doping aluminium into the ZnS shell of CuInS₂@ZnS quantum dots, the team created a built-in self-passivating mechanism. The aluminium forms a protective oxide layer that helps suppress photodegradation while preserving the desirable optical properties of the nanocrystals. The novelty lies not only in improving one quantum-dot system, but in reframing oxidation as a useful design tool. This concept later becomes the foundation for broader oxide-protection and ceramic-stable nanocrystal strategies.

 

Citation: P. Rao, W. Yao, Z. Li, L. Kong, W. Zhang, and L. Li, “Highly stable CuInS₂@ZnS:Al core@shell quantum dots: The role of aluminium self-passivation,” Chemical Communications, vol. 51, pp. 8757–8760, 2015, doi: 10.1039/C5CC01137J.