Highlights

• This paper solves the trade-off between ceramic-like stability and solution processability for micro-LED color conversion.
• K₂CO₃-assisted selective pore sealing produces CsPbBr₃-SiO₂ nanospheres with emission efficiency above 87% and strong isolation from the environment.
• The particles are size-homogeneous, dispersible, ultra-stable, and suitable for photolithographic inks with pixels smaller than 20 micrometers.

Summary

Micro-LED displays require color-conversion materials that are bright, stable, and processable at very small pixel sizes. Conventional phosphors are too large, while many quantum dots are too unstable. This paper introduces a key processing breakthrough: perovskite nanocrystals are grown and sealed inside mesoporous silica nanospheres using K₂CO₃ as a selective pore-sealing agent. The result is a nanosphere that combines high emission efficiency, environmental protection, and fine dispersion in solution. The work is highly application-focused because it directly addresses photolithographic patterning for micro-LED displays. It represents a major step from stable powders toward printable, device-compatible nanocrystal phosphors.

Citation: M. He et al., “Ultra-stable, solution-processable CsPbBr₃-SiO₂ nanospheres for highly efficient color conversion in micro light-emitting diodes,” ACS Energy Letters, vol. 8, pp. 151–158, 2023, doi: 10.1021/acsenergylett.2c02062.