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ZnF 2 -Assisted Synthesis of Highly Luminescent InP/ZnSe/ZnS Quantum Dots for Efficient and Stable Electroluminescence.
- Source :
-
Nano letters [Nano Lett] 2022 May 25; Vol. 22 (10), pp. 4067-4073. Date of Electronic Publication: 2022 May 10. - Publication Year :
- 2022
-
Abstract
- 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 ZnF <subscript>2</subscript> 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/m <superscript>2</superscript> and a T <subscript>95</subscript> lifetime of >32 000 h at 100 cd/m <superscript>2</superscript> . This safe approach is anticipated to be applied for a wide range of III-V QDs.
- Subjects :
- Hydrofluoric Acid
Sulfides
Zinc Compounds
Quantum Dots
Subjects
Details
- Language :
- English
- ISSN :
- 1530-6992
- Volume :
- 22
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- Nano letters
- Publication Type :
- Academic Journal
- Accession number :
- 35536635
- Full Text :
- https://doi.org/10.1021/acs.nanolett.2c00763