Post-processing preparation of perovskite nanorods for polarized display

In recent years, colloidal semiconductor nanocrystals and quantum nanostructures of various sizes and shapes have emerged as excellent solution-processable luminescent materials for display applications. Using multi-dimensional nanostructures instead of spherical nanocrystals can produce linearly or circularly polarized light with superior color purity and brightness. This substitution greatly enhances the performance and efficiency of future display technologies. Perovskite nanorods, as novel display materials, have garnered significant attention, especially in polarized optics, showing great potential. This study proposes a simple post-treatment method to fabricate long CsPbBr₃ perovskite nanorods by post-treating CsPbBr₃ nanocrystals with a PbBr₂ solution. This treatment significantly improved the aspect ratio of the nanorods (NRs), increasing the anisotropy value from 0.04 to 0.18. Additionally, the surface defects of the treated nanorods were reduced, and the PLQY increased from 37.6% to a maximum of 49.3%, with a marked improvement in stability.