Details

Autor(en) / Beteiligte

• Liu, Zhenyang
• Hao, Chaoqi
• Sun, Yingying
• Wang, Junyu
• Dube, Lacie
• Chen, Mingjun
• Dang, Wei
• Hu, Jinxiao
• Li, Xu
• Chen, Ou

Titel

Rigid CuInS 2 /ZnS Core/Shell Quantum Dots for High Performance Infrared Light-Emitting Diodes

Ist Teil von

• Nano letters, 2024-05, Vol.24 (17), p.5342-5350

Ort / Verlag

United States

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

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