Metal Fluorides Passivate II-VI and III-V Quantum Dots

被引：3

作者：

Valleix, Rodolphe ^{[1
,2
]}

Zhang, William ^{[1
]}

Jordan, Abraham J. ^{[1
]}

Guillemeney, Lilian ^{[2
]}

Castro, Leslie G. ^{[1
]}

Zekarias, Bereket L. ^{[1
]}

Park, Sungho V. ^{[1
]}

Wang, Oliver ^{[1
]}

Owen, Jonathan S. ^{[1
]}

机构：

[1] Columbia Univ, Dept Chem, New York, NY 10027 USA

[2] Univ Lyon, ENS Lyon, CNRS, Lab Chim, F-69342 Lyon, France

来源：

NANO LETTERS | 2024年 / 24卷 / 19期

关键词：

quantum dots; fluoride; surface passivation; phosphonium; photoluminescence quantum yield; INP NANOCRYSTALS; LIGAND-EXCHANGE; NMR; SURFACE; PHOTOLUMINESCENCE; STOICHIOMETRY;

D O I：

10.1021/acs.nanolett.4c00610

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Quantum dots (QDs) with metal fluoride surface ligands were prepared via reaction with anhydrous oleylammonium fluoride. Carboxylate terminated II-VI QDs underwent carboxylate for fluoride exchange, while InP QDs underwent photochemical acidolysis yielding oleylamine, PH3, and InF3. The final photoluminescence quantum yield (PLQY) reached 83% for InP and near unity for core-shell QDs. Core-only CdS QDs showed dramatic improvements in PLQY, but only after exposure to air. Following etching, the InP QDs were bound by oleylamine ligands that were characterized by the frequency and breadth of the corresponding nu(N-H) bands in the infrared absorption spectrum. The fluoride content (1.6-9.2 nm(-2)) was measured by titration with chlorotrimethylsilane and compared with the oleylamine content (2.3-5.1 nm(-2)) supporting the formation of densely covered surfaces. The influence of metal fluoride adsorption on the air stability of QDs is discussed.

引用

页码：5722 / 5728

页数：7

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