Synthesis of bright and stable CsPbBr3 nanoplatelets via dual-functional short-chain ligand passivation for deep-blue light-emitting diodes

Abstract

CsPbBr₃ nanoplatelets exhibit immense potential in the field of next-generation ultra-high-definition displays due to their narrow linewidth and wide color gamut characteristics. However, material stability issues and low luminous efficiency severely hinder their practical applications. Herein, by utilizing the dual-functional short-chain ligand 2-bromoethanesulfonic acid, we successfully synthesized CsPbBr₃ NPL with an emission peak at 458 nm and a photoluminescence quantum yield of up to 84%. 2-Bromoethanesulfonic acid effectively passivates surface defects and enhances the structural stability of CsPbBr₃ nanoplatelets. The fabricated device achieved an efficiency of 0.8% at 460 nm.