量子点
量子产额
蚀刻(微加工)
光致发光
材料科学
磷化铟
发光二极管
光化学
水溶液
化学
纳米技术
光电子学
荧光
有机化学
图层(电子)
光学
砷化镓
物理
作者
Yaning Luo,Xu Cao,Sheng Wang,Qianqian Wu,Fan Cao,Lin Wang,Xue Zheng,Xuyong Yang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-12-16
标识
DOI:10.1021/acs.nanolett.4c05832
摘要
Indium phosphide (InP) quantum dots (QDs) are promising alternative heavy-metal CdSe QDs for light-emitting diode (LED) application. However, their highly reactive core surface is prone to oxidation, which reduces the photoluminescence quantum yield (PL QY) and impedes subsequent shell growth. Traditional etching methods using HF aqueous solution are problematic as water can induce reoxidation during or after etching. Herein, we present HF pyridine solution as a more effective etching reagent to enhance luminous properties of InP QDs. Pyridine molecules replace the bulky carboxyl ligand, reducing steric hindrance and allowing HF easier access to the core for removing surface oxides. This ligand exchange promotes rapid shell growth, minimizing core exposure to the reaction environment and thereby reoxidation risk. Consequently, the as-prepared core/shell QDs exhibit a high PL QY of ∼90%, and the corresponding LEDs achieve an external quantum efficiency of 15.4% along with a long operational lifetime of 6819 h, outperforming the control devices.
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