Rigid CuInS2/ZnS Core/Shell Quantum Dots for High Performance Infrared Light-Emitting Diodes

• DOI: 10.1021/acs.nanolett.4c01249
• Publication Date: 2024-04-17T19:10:51Z
• Authors: Zhenyang Liu; Chaoqi Hao; Yingying Sun; Junyu Wang; Lacie Dube; Mingjun Chen; Wei Dang; Jinxiao Hu; Xu Li; Ou Chen
• Keywords: Auger effect; Quantum yield

CuInS2 (CIS) quantum dots (QDs) represent an important class of colloidal materials with broad application potential, owing to their low toxicity and unique optical properties. Although coating a ZnS shell has been identified as crucial method enhance performance, the occurrence cation exchange historically resulted in unintended formation Cu–In–Zn–S alloyed QDs, causing detrimental blueshifts both absorption photoluminescence (PL) spectral profiles. In this study, we present facile one-pot synthetic strategy aimed at impeding process promoting growth on CIS core QDs. The suppression electron–phonon interaction Auger recombination by rigid results CIS/ZnS core/shell QDs that exhibit wide near-infrared (NIR) emission coverage remarkable PL yield 92.1%. This effect boosts fabrication high-performance, QD-based NIR light-emitting diodes best stability such so far.