分子筛
介孔材料
量子点
钙钛矿(结构)
纳米技术
材料科学
吸附
胶体
涂层
量子产额
卤化物
化学工程
薄膜
纳米颗粒
分解
化学
无机化学
有机化学
光学
荧光
工程类
物理
催化作用
作者
Jin Young Kim,Byung Gi Kim,Woongsik Jang,Dong Hwan Wang
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2022-01-10
卷期号:10 (3): 1115-1124
被引量:3
标识
DOI:10.1021/acssuschemeng.1c05923
摘要
Attaining good stability while maintaining superior properties is one of the main requirements for the application of organic/inorganic halide perovskite CH3NH3PbBr3 quantum dots (QDs) in lighting and display devices. However, stability and surface defects of QDs have been negatively affected because of the presence of H2O in solvents and humidity in air. Herein, a facile strategy is proposed to synthesize colloidal QDs with long-term luminescent and high quantum yield (QY) (92.1%) at room temperature. Molecular sieves are used with a pore size of 3 Å to selectively induce adsorption and reflection according to the size of the diameter. H2O removal is facilitated by the addition of molecular sieves to a polar solvent, thereby generating dehydrated QDs. Contact angle measurement and surface energy calculation (Owen–Wendt method) of a thin film coated with the dehydrated QDs confirm hydrophobicity. Moreover, 30 days after coating thin films with pristine and dehydrated QDs, cracks are observed on the pristine QD-coated thin film surface due to the decomposition of QDs. This is a crack formed by the separation of the QD ligand and the perovskite decomposition. Furthermore, dehydrated QDs maintained a PL intensity of 83.7% after 30 days. The proposed synthesis method is effective for the rational design of high-quality QDs having high efficiency and long-term stability.
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