High-Performance Quantum Dots with Synergistic Doping and Oxide Shell Protection Synthesized by Cation Exchange Conversion of Ternary-Composition Nanoparticles

Qiumei Di, Xiyue Zhu, Jia Liu, Xiaobin Zhang, Huishan Shang, Wenxing Chen, Jiajia Liu, Hongpan Rong, Meng Xu, Jiatao Zhang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The insertion of cation impurities into quantum dots (QDs) as a dopant has been proved to be an efficient way to tailor their optical, electronic, and magnetic properties; however, the low quantum yield (QY) and poor photostability strongly limit their further applications. We report a strategy to coat a thin oxide shell around the heterovalent doped QDs to enhance their QYs and photostabilities simultaneously. In the case of Ag+-doped CdS QDs, the controlled cation exchange reaction between Cd2+ and ternary Ag3SbS3 nanoparticles not only realizes the Ag+ doping in CdS QDs but also generates a thin Sb2O3 shell around the surface of the QDs. Enabled by such, as-prepared CdS:Ag@Sb2O3 QDs exhibited enhanced photostability and high QY of 66.5%. We envision that the findings presented here will inspire more novel protocols for advancing the practical applications of doped QDs.

Original languageEnglish
Pages (from-to)2606-2615
Number of pages10
JournalJournal of Physical Chemistry Letters
Volume10
Issue number10
DOIs
Publication statusPublished - 2019 May 16
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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