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Fast synthesis of CdS/CdS host-shell quantum dots

Min Zeng (UGent) , Shalini Singh (UGent) , Zeger Hens (UGent) and Rik Van Deun (UGent)
Author
Organization
Abstract
The downconverting photoluminescence with heterogeneous core/shell nanocrystals has been largely investigated. While the homogeneous core/shell quantum dots have seldom been reported. For the small CdS (~2.2 nm) reference quantum dot, it exhibits serious trap emission. In most cases, wider-gap heterogeneous shells of ZnS1or ZnSe2 by slowly hot-injection method are employed to improve the surface passivation and thus improving its photoluminescence performance. The step by step hot-injection method is time-consuming. While the homogeneous CdS shell with fast and controllable epitaxial growth has never been reported. Herein, we demonstrate a flash fabrication method to synthesize the host-shell CdS capped CdS (CdS/CdS). The shell with different layers can be controlled by the amount of precursors added initially. The fluorescence results of the as synthesized host-shell CdS quantum dots, show that the growth of the CdS shell can efficiently remove the surface trap states, leading to high photoluminescence performance. Furthermore, this special core-host shell structure is used to increase the size of CdS, and to adjust the dopant positions inside nanocrystals.3 The fast synthetic procedure and the special host-shell structure present great potentials in preparing large-scale productions of core/shell quantum dots and site-dependent ions doped nanocrystals to avoid lattice mismatch caused by hetero-shell materials, respectively.
Keywords
CdS, quantum dots, core/shell, fast synthesis

Citation

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Chicago
Zeng, Min, Shalini Singh, Zeger Hens, and Rik Van Deun. 2018. “Fast Synthesis of CdS/CdS Host-shell Quantum Dots.” In ChemCYS Book of Abstracts. Koninklijke Vlaamse Chemische Vereniging (KVCV).
APA
Zeng, M., Singh, S., Hens, Z., & Van Deun, R. (2018). Fast synthesis of CdS/CdS host-shell quantum dots. ChemCYS book of abstracts. Presented at the 14th Chemistry conference for Young Scientists (ChemCYS 2018), Koninklijke Vlaamse Chemische Vereniging (KVCV).
Vancouver
1.
Zeng M, Singh S, Hens Z, Van Deun R. Fast synthesis of CdS/CdS host-shell quantum dots. ChemCYS book of abstracts. Koninklijke Vlaamse Chemische Vereniging (KVCV); 2018.
MLA
Zeng, Min, Shalini Singh, Zeger Hens, et al. “Fast Synthesis of CdS/CdS Host-shell Quantum Dots.” ChemCYS Book of Abstracts. Koninklijke Vlaamse Chemische Vereniging (KVCV), 2018. Print.
@inproceedings{8575711,
  abstract     = {The downconverting photoluminescence with heterogeneous core/shell nanocrystals has been largely investigated. While the homogeneous core/shell quantum dots have seldom been reported. For the small CdS (\unmatched{ff5e}2.2 nm) reference quantum dot, it exhibits serious trap emission. In most cases, wider-gap heterogeneous shells of ZnS1or ZnSe2 by slowly hot-injection method are employed to improve the surface passivation and thus improving its photoluminescence performance. The step by step hot-injection method is time-consuming. While the homogeneous CdS shell with fast and controllable epitaxial growth has never been reported. Herein, we demonstrate a flash fabrication method to synthesize the host-shell CdS capped CdS (CdS/CdS). The shell with different layers can be controlled by the amount of precursors added initially. The fluorescence results of the as synthesized host-shell CdS quantum dots, show that the growth of the CdS shell can efficiently remove the surface trap states, leading to high photoluminescence performance. Furthermore, this special core-host shell structure is used to increase the size of CdS, and to adjust the dopant positions inside nanocrystals.3 The fast synthetic procedure and the special host-shell structure present great potentials in preparing large-scale productions of core/shell quantum dots and site-dependent ions doped nanocrystals to avoid lattice mismatch caused by hetero-shell materials, respectively.},
  author       = {Zeng, Min and Singh, Shalini and Hens, Zeger and Van Deun, Rik},
  booktitle    = {ChemCYS book of abstracts},
  language     = {eng},
  location     = {Blankenberge, Belgium},
  publisher    = {Koninklijke Vlaamse Chemische Vereniging (KVCV)},
  title        = {Fast synthesis of CdS/CdS host-shell quantum dots},
  year         = {2018},
}