ZnSe/ZnS Core/Shell Quantum Dots with Superior Optical Properties through Thermodynamic Shell Growth
Epitaxial growth of a protective semiconductor shell on a colloidal quantum dot (QD) core is the key strategy for achieving high fluorescence quantum efficiency and essential stability for optoelectronic applications and biotagging with emissive QDs. Herein we investigate the effect of shell growth...
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| Published in: | Nano letters Vol. 20; no. 4; pp. 2387 - 2395 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
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American Chemical Society
08-04-2020
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| Abstract | Epitaxial growth of a protective semiconductor shell on a colloidal quantum dot (QD) core is the key strategy for achieving high fluorescence quantum efficiency and essential stability for optoelectronic applications and biotagging with emissive QDs. Herein we investigate the effect of shell growth rate on the structure and optical properties in blue-emitting ZnSe/ZnS QDs with narrow emission line width. Tuning the precursor reactivity modifies the growth mode of ZnS shells on ZnSe cores transforming from kinetic (fast) to thermodynamic (slow) growth regimes. In the thermodynamic growth regime, enhanced fluorescence quantum yields and reduced on–off blinking are achieved. This high performance is ascribed to the effective avoidance of traps at the interface between the core and the shell, which are detrimental to the emission properties. Our study points to a general strategy to obtain high-quality core/shell QDs with enhanced optical properties through controlled reactivity yielding shell growth in the thermodynamic limit. |
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| AbstractList | Epitaxial growth of a protective semiconductor shell on a colloidal quantum dot (QD) core is the key strategy for achieving high fluorescence quantum efficiency and essential stability for optoelectronic applications and biotagging with emissive QDs. Herein we investigate the effect of shell growth rate on the structure and optical properties in blue-emitting ZnSe/ZnS QDs with narrow emission line width. Tuning the precursor reactivity modifies the growth mode of ZnS shells on ZnSe cores transforming from kinetic (fast) to thermodynamic (slow) growth regimes. In the thermodynamic growth regime, enhanced fluorescence quantum yields and reduced on–off blinking are achieved. This high performance is ascribed to the effective avoidance of traps at the interface between the core and the shell, which are detrimental to the emission properties. Our study points to a general strategy to obtain high-quality core/shell QDs with enhanced optical properties through controlled reactivity yielding shell growth in the thermodynamic limit. Epitaxial growth of a protective semiconductor shell on a colloidal quantum dot (QD) core is the key strategy for achieving high fluorescence quantum efficiency and essential stability for optoelectronic applications and biotagging with emissive QDs. Herein we investigate the effect of shell growth rate on the structure and optical properties in blue-emitting ZnSe/ZnS QDs with narrow emission line width. Tuning the precursor reactivity modifies the growth mode of ZnS shells on ZnSe cores transforming from kinetic (fast) to thermodynamic (slow) growth regimes. In the thermodynamic growth regime, enhanced fluorescence quantum yields and reduced on–off blinking are achieved. This high performance is ascribed to the effective avoidance of traps at the interface between the core and the shell, which are detrimental to the emission properties. Our study points to a general strategy to obtain high-quality core/shell QDs with enhanced optical properties through controlled reactivity yielding shell growth in the thermodynamic limit. |
| Author | Banin, Uri Slobodkin, Ilya Remennik, Sergei Ji, Botao Koley, Somnath |
| AuthorAffiliation | Institute of Chemistry The Center for Nanoscience and Nanotechnology Westlake Institute for Advanced Study Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University and Institute of Advanced Technology |
| AuthorAffiliation_xml | – name: The Center for Nanoscience and Nanotechnology – name: Westlake Institute for Advanced Study – name: Institute of Chemistry – name: Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University and Institute of Advanced Technology |
| Author_xml | – sequence: 1 givenname: Botao orcidid: 0000-0002-5775-7421 surname: Ji fullname: Ji, Botao organization: Westlake Institute for Advanced Study – sequence: 2 givenname: Somnath orcidid: 0000-0002-6826-1501 surname: Koley fullname: Koley, Somnath organization: The Center for Nanoscience and Nanotechnology – sequence: 3 givenname: Ilya surname: Slobodkin fullname: Slobodkin, Ilya organization: The Center for Nanoscience and Nanotechnology – sequence: 4 givenname: Sergei surname: Remennik fullname: Remennik, Sergei organization: The Center for Nanoscience and Nanotechnology – sequence: 5 givenname: Uri orcidid: 0000-0003-1698-2128 surname: Banin fullname: Banin, Uri email: uri.banin@mail.huji.ac.il organization: The Center for Nanoscience and Nanotechnology |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/32134676$$D View this record in MEDLINE/PubMed |
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| Keywords | thermodynamic core/shell QDs ZnSe/ZnS heavy-metal-free kinetic |
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| Snippet | Epitaxial growth of a protective semiconductor shell on a colloidal quantum dot (QD) core is the key strategy for achieving high fluorescence quantum... Epitaxial growth of a protective semiconductor shell on a colloidal quantum dot (QD) core is the key strategy for achieving high fluorescence quantum... |
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| Title | ZnSe/ZnS Core/Shell Quantum Dots with Superior Optical Properties through Thermodynamic Shell Growth |
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