Highlights

• The paper reports CsPbBr₃ quantum dots incorporated into a silica/alumina monolith using a water-free sol-gel process.
• The transparent monolith reaches photoluminescence quantum yields up to 90% and remains photostable under strong blue light for 300 hours.
• DDAB ligand exchange is identified as a key step that protects quantum-dot surfaces during sol-gel processing and prevents aggregation.

Summary

This study strengthens the oxide-encapsulation strategy by moving from silica spheres to a silica/alumina monolith. The dual-oxide matrix improves protection while preserving the brightness and color purity of CsPbBr₃ perovskite quantum dots. A key technical insight is that surface ligand management matters: DDAB ligand exchange helps prevent damage and aggregation during the sol-gel process, allowing the monolith to remain transparent and highly luminescent. The material can be mixed into resin and used as a color-converting layer on blue LEDs. This paper shows that perovskite quantum dots can be stabilized in a more robust inorganic environment while remaining useful for display and lighting applications.

Citation: Z. Li, L. Kong, S. Huang, and L. Li, “Highly luminescent and ultrastable CsPbBr₃ perovskite quantum dots incorporated into a silica/alumina monolith,” Angewandte Chemie International Edition, vol. 56, pp. 8134–8138, 2017, doi: 10.1002/anie.201703264.