Bright and Stable Blue-Emitting CsPbBr3 Perovskite Nanoplatelets Achieved via Surface Manipulation Using Organic Spacers
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Lead-halide perovskite nanocrystals (PNCs) are of great interest in next-generation light-emitting diodes (LEDs) owing to their outstanding optical features. While red- and green-emitting PNCs have shown high device performance in LEDs, blue-emitting PNCs have lagged behind. In addition, achieving and maintaining efficient blue emission in both colloidal and thin-film forms has been a challenge. Here, we present the controlled synthesis and surface manipulation of blue-emitting CsPbBr3 colloidal nanoplatelets (NPLs), exhibiting bright and stable blue emission due to 1D quantum confinement induced by crystal dimension control. We employ surface passivation strategies using organic spacers to enhance optical properties and colloidal stability. We also show the fabrication of CsPbBr3 NPL-based thin films via ligand exchange. This process replaces long-chain ligands with short-chain ligands, improving the charge injection ability for potential application as blue emission layers in LEDs.