Highlights

• This paper refines high-temperature solid-state synthesis by using rigid mesoporous silica to precisely confine nanocrystal growth.
• The strategy produces stable and uniform CsPbBr₃ nanocrystals with PLQY up to 93% and an 18 nm emission linewidth.
• Pre-hydrolysis sealing improves stability, while the high emission intensity makes the material attractive for down-conversion display emitters.

Summary

This study deepens the understanding of how high-temperature confined synthesis can produce both stability and high optical quality. At high temperatures, nanocrystals usually grow too fast and become too large or non-uniform. Professor Li’s team showed that thermally stable, uniform pores in mesoporous silica can constrain growth within the quantum-confinement regime. This allows the material to reach high quantum yield and narrow emission, while the sealing strategy improves durability. The work is a key step toward controllable solid-state synthesis: it shows that high-temperature methods can produce nanocrystals comparable in quality to colloidal systems, but with better stability and lower solvent dependence.

Citation: Q. Zhang et al., “Confined synthesis of stable and uniform CsPbBr₃ nanocrystals with high quantum yield up to 90% by high-temperature solid-state reaction,” Advanced Optical Materials, article 2002130, 2021, doi: 10.1002/adom.202002130.