期刊
NANO LETTERS
卷 22, 期 10, 页码 4067-4073出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c00763
关键词
InP; quantum dots; core; shell; electroluminescence; light-emitting diodes
类别
资金
- National Natural Science Foundation of China [22101233, 61922028, 61874039]
- Foundation of Westlake University
- Innovation Research Team of Science and Technology in Henan Province [20IRTSTHN020]
A new method using inorganic salt ZnF2 instead of hydrofluoric acid to synthesize InP/ZnSe/ZnS core/shell/shell quantum dots is proposed in this study. The resulting quantum dots show higher photoluminescence efficiency and thermal stability, and can achieve high brightness emission in large sizes.
High-quality InP-based quantum dots (QDs) have become very promising, environmentally benign light emitters for display applications, but their synthesis generally entails hazardous hydrofluoric acid. Here, we present a highly facile route to InP/ZnSe/ZnS core/shell/shell QDs with a near-unity photoluminescence quantum yield. As the key additive, the inorganic salt ZnF2 mildly reacts with carboxylic acid at a high temperature and in situ generates HF, which eliminates surface oxide impurities, thus facilitating epitaxial shell growth. The resulting InP/ZnSe/ZnS QDs exhibit a narrower emission line width and better thermal stability in comparison with QDs synthesized with hydrofluoric acid. Light-emitting diodes using large-sized InP/ ZnSe/ZnS QDs without replacing original ligands achieve the highest peak external quantum efficiency of 22.2%, to the best of our knowledge, along with a maximum brightness of > 110 000 cd/m2 and a T95 lifetime of > 32 000 h at 100 cd/m2 . This safe approach is anticipated to be applied for a wide range of III-V QDs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据