Constructing ZnTe Spherical Quantum Well for Efficient Light Emission
(2024) In Nano Letters 24(17). p.5238-5245- 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
- Cao, Kequan ; Yu, Binbin ; Huang, Fei ; Pan, Qinying LU ; Wang, Junfeng ; Ning, Jiajia ; Zheng, Kaibo LU ; Pullerits, Tõnu LU and Tian, Jianjun
- organization
- publishing date
- 2024
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- coherently strained heterostructure, high quantum yield, mismatch defects, Spherical quantum well, thermodynamic shell growth
- in
- Nano Letters
- volume
- 24
- issue
- 17
- pages
- 8 pages
- 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
- 2024-08-09 19:30:53
@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 >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}}, number = {{17}}, pages = {{5238--5245}}, 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}}, volume = {{24}}, year = {{2024}}, }