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Constructing ZnTe Spherical Quantum Well for Efficient Light Emission

Cao, Kequan ; Yu, Binbin ; Huang, Fei ; Pan, Qinying LU ; Wang, Junfeng ; Ning, Jiajia ; Zheng, Kaibo LU ; Pullerits, Tõnu LU and Tian, Jianjun (2024) In Nano Letters
Abstract

ZnTe colloidal semiconductor nanocrystals (NCs) have shown promise for light-emitting diodes (LEDs) and displays, because they are free from toxic heavy metals (Cd). However, so far, their low photoluminescence (PL) efficiency (∼30%) has hindered their applications. Herein, we devised a novel structure of ZnTe NCs with the configuration of ZnSe (core)/ZnTe (spherical quantum well, SQW)/ZnSe (shell). The inner layer ZnTe was grown at the surface of ZnSe core with avoiding using highly active and high-risk Zn sources. Due to the formation of coherently strained heterostructure which reduced the lattice mismatch, and the thermodynamic growth of ZnTe, the surface or interface defects were suppressed. A high PL efficiency of >60% was... (More)

ZnTe colloidal semiconductor nanocrystals (NCs) have shown promise for light-emitting diodes (LEDs) and displays, because they are free from toxic heavy metals (Cd). However, so far, their low photoluminescence (PL) efficiency (∼30%) has hindered their applications. Herein, we devised a novel structure of ZnTe NCs with the configuration of ZnSe (core)/ZnTe (spherical quantum well, SQW)/ZnSe (shell). The inner layer ZnTe was grown at the surface of ZnSe core with avoiding using highly active and high-risk Zn sources. Due to the formation of coherently strained heterostructure which reduced the lattice mismatch, and the thermodynamic growth of ZnTe, the surface or interface defects were suppressed. A high PL efficiency of >60% was obtained for the green light-emitting ZnSe/ZnTe/ZnSe SQWs after ZnS outer layer passivation, which is the highest value for colloidal ZnTe-based NCs. This work paves the way for the development of novel semiconductor NCs for luminescent and display applications.

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author
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organization
publishing date
type
Contribution to journal
publication status
in press
subject
keywords
coherently strained heterostructure, high quantum yield, mismatch defects, Spherical quantum well, thermodynamic shell growth
in
Nano Letters
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:38629707
  • scopus:85190728148
ISSN
1530-6984
DOI
10.1021/acs.nanolett.4c00734
language
English
LU publication?
yes
id
969d7287-6121-4ea7-b0f6-cb56a7b5b090
date added to LUP
2024-05-03 10:32:19
date last changed
2024-05-17 12:57:42
@article{969d7287-6121-4ea7-b0f6-cb56a7b5b090,
  abstract     = {{<p>ZnTe colloidal semiconductor nanocrystals (NCs) have shown promise for light-emitting diodes (LEDs) and displays, because they are free from toxic heavy metals (Cd). However, so far, their low photoluminescence (PL) efficiency (∼30%) has hindered their applications. Herein, we devised a novel structure of ZnTe NCs with the configuration of ZnSe (core)/ZnTe (spherical quantum well, SQW)/ZnSe (shell). The inner layer ZnTe was grown at the surface of ZnSe core with avoiding using highly active and high-risk Zn sources. Due to the formation of coherently strained heterostructure which reduced the lattice mismatch, and the thermodynamic growth of ZnTe, the surface or interface defects were suppressed. A high PL efficiency of &gt;60% was obtained for the green light-emitting ZnSe/ZnTe/ZnSe SQWs after ZnS outer layer passivation, which is the highest value for colloidal ZnTe-based NCs. This work paves the way for the development of novel semiconductor NCs for luminescent and display applications.</p>}},
  author       = {{Cao, Kequan and Yu, Binbin and Huang, Fei and Pan, Qinying and Wang, Junfeng and Ning, Jiajia and Zheng, Kaibo and Pullerits, Tõnu and Tian, Jianjun}},
  issn         = {{1530-6984}},
  keywords     = {{coherently strained heterostructure; high quantum yield; mismatch defects; Spherical quantum well; thermodynamic shell growth}},
  language     = {{eng}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Nano Letters}},
  title        = {{Constructing ZnTe Spherical Quantum Well for Efficient Light Emission}},
  url          = {{http://dx.doi.org/10.1021/acs.nanolett.4c00734}},
  doi          = {{10.1021/acs.nanolett.4c00734}},
  year         = {{2024}},
}