Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals
Recently, quantum-dot-based core/shell structures have gained significance due to their optical, optoelectronic, and magnetic attributes. Controlling the fluorescence lifetime of QDs shells is imperative for various applications, including light-emitting diodes and single-photon sources. In this wor...
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MDPI AG
2022-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/13/2277 |
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| author | Muhammad Haroon Rashid Ants Koel Toomas Rang Nadeem Nasir Nadeem Sabir Faheem Ameen Abher Rasheed |
| author_facet | Muhammad Haroon Rashid Ants Koel Toomas Rang Nadeem Nasir Nadeem Sabir Faheem Ameen Abher Rasheed |
| author_sort | Muhammad Haroon Rashid |
| collection | DOAJ |
| description | Recently, quantum-dot-based core/shell structures have gained significance due to their optical, optoelectronic, and magnetic attributes. Controlling the fluorescence lifetime of QDs shells is imperative for various applications, including light-emitting diodes and single-photon sources. In this work, novel Cu-doped CdS/ZnS shell structures were developed to enhance the photoluminescence properties. The objective was to materialize the Cu-doped CdS/ZnS shells by the adaptation of a two-stage high-temperature doping technique. The developed nanostructures were examined with relevant characterization techniques such as transmission electron microscopy (TEM) and ultraviolet–visible (UV–vis) emission/absorption spectroscopy. Studying fluorescence, we witnessed a sharp emission peak at a wavelength of 440 nm and another emission peak at a wavelength of 620 nm, related to the fabricated Cu-doped CdS/ZnS core/shell QDs. Our experimental results revealed that Cu-doped ZnS shells adopted the crystal structure of CdS due to its larger bandgap. Consequently, this minimized lattice mismatch and offered better passivation to any surface defects, resulting in increased photoluminescence. Our developed core/shells are highly appropriate for the development of efficient light-emitting diodes. |
| first_indexed | 2024-03-09T03:59:30Z |
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| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T03:59:30Z |
| publishDate | 2022-07-01 |
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| spelling | doaj.art-70ce7cb1eb7b406f829d115a1bd5cd472023-12-03T14:15:20ZengMDPI AGNanomaterials2079-49912022-07-011213227710.3390/nano12132277Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell NanocrystalsMuhammad Haroon Rashid0Ants Koel1Toomas Rang2Nadeem Nasir3Nadeem Sabir4Faheem Ameen5Abher Rasheed6Department of Textile Engineering, National Textile University, Faisalabad 37610, PakistanThomas Johann Seebeck Department of Electronics, Tallinn University of Technology, Ehitajate tee 5, 12616 Tallinn, EstoniaThomas Johann Seebeck Department of Electronics, Tallinn University of Technology, Ehitajate tee 5, 12616 Tallinn, EstoniaDepartment of Applied Sciences, National Textile University, Faisalabad 37610, PakistanDepartment of Physics, Government College University, Faisalabad 38000, PakistanSchool of Natural Sciences, National University of Sciences and Technology, Islamabad 44000, PakistanDepartment of Textile Engineering, National Textile University, Faisalabad 37610, PakistanRecently, quantum-dot-based core/shell structures have gained significance due to their optical, optoelectronic, and magnetic attributes. Controlling the fluorescence lifetime of QDs shells is imperative for various applications, including light-emitting diodes and single-photon sources. In this work, novel Cu-doped CdS/ZnS shell structures were developed to enhance the photoluminescence properties. The objective was to materialize the Cu-doped CdS/ZnS shells by the adaptation of a two-stage high-temperature doping technique. The developed nanostructures were examined with relevant characterization techniques such as transmission electron microscopy (TEM) and ultraviolet–visible (UV–vis) emission/absorption spectroscopy. Studying fluorescence, we witnessed a sharp emission peak at a wavelength of 440 nm and another emission peak at a wavelength of 620 nm, related to the fabricated Cu-doped CdS/ZnS core/shell QDs. Our experimental results revealed that Cu-doped ZnS shells adopted the crystal structure of CdS due to its larger bandgap. Consequently, this minimized lattice mismatch and offered better passivation to any surface defects, resulting in increased photoluminescence. Our developed core/shells are highly appropriate for the development of efficient light-emitting diodes.https://www.mdpi.com/2079-4991/12/13/2277quantum dots (QDs)nanocrystalscopper dopingcadmium sulfidezinc sulfideoptical properties |
| spellingShingle | Muhammad Haroon Rashid Ants Koel Toomas Rang Nadeem Nasir Nadeem Sabir Faheem Ameen Abher Rasheed Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals Nanomaterials quantum dots (QDs) nanocrystals copper doping cadmium sulfide zinc sulfide optical properties |
| title | Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals |
| title_full | Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals |
| title_fullStr | Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals |
| title_full_unstemmed | Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals |
| title_short | Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals |
| title_sort | optical dynamics of copper doped cadmium sulfide cds and zinc sulfide zns quantum dots core shell nanocrystals |
| topic | quantum dots (QDs) nanocrystals copper doping cadmium sulfide zinc sulfide optical properties |
| url | https://www.mdpi.com/2079-4991/12/13/2277 |
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