Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties
Abstract Here, we report efficient composition-tunable Cu-doped ZnInS/ZnS (core and core/shell) colloidal nanocrystals (CNCs) synthesized by using a colloidal non-injection method. The initial precursors for the synthesis were used in oleate form rather than in powder form, resulting in a nearly def...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-06-01
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| Series: | Nanoscale Research Letters |
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| Online Access: | http://link.springer.com/article/10.1186/s11671-018-2599-x |
| _version_ | 1797721139762429952 |
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| author | Manpreet Kaur Ashma Sharma Murat Olutas Onur Erdem Akshay Kumar Manoj Sharma Hilmi Volkan Demir |
| author_facet | Manpreet Kaur Ashma Sharma Murat Olutas Onur Erdem Akshay Kumar Manoj Sharma Hilmi Volkan Demir |
| author_sort | Manpreet Kaur |
| collection | DOAJ |
| description | Abstract Here, we report efficient composition-tunable Cu-doped ZnInS/ZnS (core and core/shell) colloidal nanocrystals (CNCs) synthesized by using a colloidal non-injection method. The initial precursors for the synthesis were used in oleate form rather than in powder form, resulting in a nearly defect-free photoluminescence (PL) emission. The change in Zn/In ratio tunes the percentage incorporation of Cu in CNCs. These highly monodisperse Cu-doped ZnInS CNCs having variable Zn/In ratios possess peak emission wavelength tunable from 550 to 650 nm in the visible spectrum. The quantum yield (QY) of these synthesized Cd-free CNCs increases from 6.0 to 65.0% after coating with a ZnS shell. The CNCs possessing emission from a mixed contribution of deep trap and dopant states to only dominant dopant-related Stokes-shifted emission are realized by a careful control of stoichiometric ratio of different reactant precursors during synthesis. The origin of this shift in emission was understood by using steady state and time-resolved fluorescence (TRF) spectroscopy studies. As a proof-of-concept demonstration, these blue excitable Cu-doped ZnInS/ZnS CNCs have been integrated with commercial blue LEDs to generate white-light emission (WLE). The suitable combination of these highly efficient doped CNCs results led to a Commission Internationale de l’Enclairage (CIE) color coordinates of (0.33, 0.31) at a color coordinate temperature (CCT) of 3694 K, with a luminous efficacy of optical radiation (LER) of 170 lm/Wopt and a color rendering index (CRI) of 88. |
| first_indexed | 2024-03-12T09:29:22Z |
| format | Article |
| id | doaj.art-954fc03e93c0425d9e8f3d17517348eb |
| institution | Directory Open Access Journal |
| issn | 1931-7573 1556-276X |
| language | English |
| last_indexed | 2024-03-12T09:29:22Z |
| publishDate | 2018-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Nanoscale Research Letters |
| spelling | doaj.art-954fc03e93c0425d9e8f3d17517348eb2023-09-02T13:58:03ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2018-06-0113111110.1186/s11671-018-2599-xCd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical PropertiesManpreet Kaur0Ashma Sharma1Murat Olutas2Onur Erdem3Akshay Kumar4Manoj Sharma5Hilmi Volkan Demir6Department of Nanotechnology, Sri Guru Granth Sahib World UniversityDepartment of Electrical and Electronics Engineering, Department of Physics, and UNAM–Institute of Materials Science and Nanotechnology, Bilkent UniversityDepartment of Electrical and Electronics Engineering, Department of Physics, and UNAM–Institute of Materials Science and Nanotechnology, Bilkent UniversityDepartment of Electrical and Electronics Engineering, Department of Physics, and UNAM–Institute of Materials Science and Nanotechnology, Bilkent UniversityDepartment of Nanotechnology, Sri Guru Granth Sahib World UniversityDepartment of Nanotechnology, Sri Guru Granth Sahib World UniversityDepartment of Electrical and Electronics Engineering, Department of Physics, and UNAM–Institute of Materials Science and Nanotechnology, Bilkent UniversityAbstract Here, we report efficient composition-tunable Cu-doped ZnInS/ZnS (core and core/shell) colloidal nanocrystals (CNCs) synthesized by using a colloidal non-injection method. The initial precursors for the synthesis were used in oleate form rather than in powder form, resulting in a nearly defect-free photoluminescence (PL) emission. The change in Zn/In ratio tunes the percentage incorporation of Cu in CNCs. These highly monodisperse Cu-doped ZnInS CNCs having variable Zn/In ratios possess peak emission wavelength tunable from 550 to 650 nm in the visible spectrum. The quantum yield (QY) of these synthesized Cd-free CNCs increases from 6.0 to 65.0% after coating with a ZnS shell. The CNCs possessing emission from a mixed contribution of deep trap and dopant states to only dominant dopant-related Stokes-shifted emission are realized by a careful control of stoichiometric ratio of different reactant precursors during synthesis. The origin of this shift in emission was understood by using steady state and time-resolved fluorescence (TRF) spectroscopy studies. As a proof-of-concept demonstration, these blue excitable Cu-doped ZnInS/ZnS CNCs have been integrated with commercial blue LEDs to generate white-light emission (WLE). The suitable combination of these highly efficient doped CNCs results led to a Commission Internationale de l’Enclairage (CIE) color coordinates of (0.33, 0.31) at a color coordinate temperature (CCT) of 3694 K, with a luminous efficacy of optical radiation (LER) of 170 lm/Wopt and a color rendering index (CRI) of 88.http://link.springer.com/article/10.1186/s11671-018-2599-xCadmium freeColloidal quantum dotsQuantum yieldCu dopingWhite-light emissionColor properties |
| spellingShingle | Manpreet Kaur Ashma Sharma Murat Olutas Onur Erdem Akshay Kumar Manoj Sharma Hilmi Volkan Demir Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties Nanoscale Research Letters Cadmium free Colloidal quantum dots Quantum yield Cu doping White-light emission Color properties |
| title | Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties |
| title_full | Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties |
| title_fullStr | Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties |
| title_full_unstemmed | Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties |
| title_short | Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties |
| title_sort | cd free cu doped znins zns core shell nanocrystals controlled synthesis and photophysical properties |
| topic | Cadmium free Colloidal quantum dots Quantum yield Cu doping White-light emission Color properties |
| url | http://link.springer.com/article/10.1186/s11671-018-2599-x |
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