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Monodisperse and size-tunable PbS colloidal quantum dots via heterogeneous precursors

Chan, Samuel ; Liu, Maning LU orcid ; Latham, Kay ; Haruta, Mitsutaka ; Kurata, Hiroki ; Teranishi, Toshiharu and Tachibana, Yasuhiro (2017) In Journal of Materials Chemistry C 5(8). p.2182-2187
Abstract

PbS quantum dots (QDs) are some of the most attractive QDs used to develop novel optoelectronic devices such as solar cells, photodetectors and biological labels. However, identifying an appropriate method to access high quality QDs with a wide size range employing lower cost, less toxic and safer precursors is not trivial. Here, we demonstrate the diffusion controlled synthesis of size-tunable PbS QDs by employing reactive N,N′-diphenylthiourea (DPTU) and PbCl2 precursors. The preparation of DPTU in 1-octadecene (ODE) and PbCl2 in oleylamine (OLA) provides turbid suspensions, ensuring that the reaction is in a diffusion controlled regime. The reaction of these reactive precursors provides access to smaller PbS QDs... (More)

PbS quantum dots (QDs) are some of the most attractive QDs used to develop novel optoelectronic devices such as solar cells, photodetectors and biological labels. However, identifying an appropriate method to access high quality QDs with a wide size range employing lower cost, less toxic and safer precursors is not trivial. Here, we demonstrate the diffusion controlled synthesis of size-tunable PbS QDs by employing reactive N,N′-diphenylthiourea (DPTU) and PbCl2 precursors. The preparation of DPTU in 1-octadecene (ODE) and PbCl2 in oleylamine (OLA) provides turbid suspensions, ensuring that the reaction is in a diffusion controlled regime. The reaction of these reactive precursors provides access to smaller PbS QDs previously unattainable using an elemental sulfur precursor. Monodisperse QDs with a size range from 2.5 to 6 nm (corresponding to band gaps of 0.8-1.6 eV) were obtained at low to moderate growth temperatures of 30-150 °C. An optical study of the reaction kinetics suggests that the heterogeneous growth environment sufficiently delays the onset of Ostwald ripening, and QDs are air-stable over a range of sizes. The synthesized PbS QDs showed high photoluminescence quantum yields of 40-70% (depending on the QD size) with the extended photoluminescence lifetime reaching 2.2 μs.

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author
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publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Materials Chemistry C
volume
5
issue
8
pages
6 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85014002941
ISSN
2050-7534
DOI
10.1039/c6tc05329g
language
English
LU publication?
no
id
44bd4a8d-04b3-4428-854f-7bf1ea00ff8b
date added to LUP
2023-08-24 12:45:27
date last changed
2023-08-28 11:19:16
@article{44bd4a8d-04b3-4428-854f-7bf1ea00ff8b,
  abstract     = {{<p>PbS quantum dots (QDs) are some of the most attractive QDs used to develop novel optoelectronic devices such as solar cells, photodetectors and biological labels. However, identifying an appropriate method to access high quality QDs with a wide size range employing lower cost, less toxic and safer precursors is not trivial. Here, we demonstrate the diffusion controlled synthesis of size-tunable PbS QDs by employing reactive N,N′-diphenylthiourea (DPTU) and PbCl<sub>2</sub> precursors. The preparation of DPTU in 1-octadecene (ODE) and PbCl<sub>2</sub> in oleylamine (OLA) provides turbid suspensions, ensuring that the reaction is in a diffusion controlled regime. The reaction of these reactive precursors provides access to smaller PbS QDs previously unattainable using an elemental sulfur precursor. Monodisperse QDs with a size range from 2.5 to 6 nm (corresponding to band gaps of 0.8-1.6 eV) were obtained at low to moderate growth temperatures of 30-150 °C. An optical study of the reaction kinetics suggests that the heterogeneous growth environment sufficiently delays the onset of Ostwald ripening, and QDs are air-stable over a range of sizes. The synthesized PbS QDs showed high photoluminescence quantum yields of 40-70% (depending on the QD size) with the extended photoluminescence lifetime reaching 2.2 μs.</p>}},
  author       = {{Chan, Samuel and Liu, Maning and Latham, Kay and Haruta, Mitsutaka and Kurata, Hiroki and Teranishi, Toshiharu and Tachibana, Yasuhiro}},
  issn         = {{2050-7534}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{2182--2187}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Journal of Materials Chemistry C}},
  title        = {{Monodisperse and size-tunable PbS colloidal quantum dots via heterogeneous precursors}},
  url          = {{http://dx.doi.org/10.1039/c6tc05329g}},
  doi          = {{10.1039/c6tc05329g}},
  volume       = {{5}},
  year         = {{2017}},
}