Synthesis of Blue-Emissive InP/GaP/ZnS Quantum Dots via Controlling the Reaction Kinetics of Shell Growth and Length of Capping Ligands
The development of blue-emissive InP quantum dots (QDs) still lags behind that of the red and green QDs because of the difficulty in controlling the reactivity of the small InP core. In this study, the reaction kinetics of the ZnS shell was controlled by varying the length of the hydrocarbon chain i...
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MDPI AG
2020-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/11/2171 |
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| author | Woosuk Lee Changmin Lee Boram Kim Yonghyeok Choi Heeyeop Chae |
| author_facet | Woosuk Lee Changmin Lee Boram Kim Yonghyeok Choi Heeyeop Chae |
| author_sort | Woosuk Lee |
| collection | DOAJ |
| description | The development of blue-emissive InP quantum dots (QDs) still lags behind that of the red and green QDs because of the difficulty in controlling the reactivity of the small InP core. In this study, the reaction kinetics of the ZnS shell was controlled by varying the length of the hydrocarbon chain in alkanethiols for the synthesis of the small InP core. The reactive alkanethiol with a short hydrocarbon chain forms the ZnS shell rapidly and prevents the growth of the InP core, thus reducing the emission wavelength. In addition, the length of the hydrocarbon chain in the fatty acid was varied to reduce the nucleation kinetics of the core. The fatty acid with a long hydrocarbon chain exhibited a long emission wavelength as a result of the rapid nucleation and growth, due to the insufficient In–P–Zn complex by the steric effect. Blue-emissive InP/GaP/ZnS QDs were synthesized with hexanethiol and lauryl acid, exhibiting a photoluminescence (PL) peak of 485 nm with a full width at half-maximum of 52 nm and a photoluminescence quantum yield of 45%. The all-solution processed quantum dot light-emitting diodes were fabricated by employing the aforementioned blue-emissive QDs as an emitting layer, and the resulting device exhibited a peak luminance of 1045 cd/m<sup>2</sup>, a current efficiency of 3.6 cd/A, and an external quantum efficiency of 1.0%. |
| first_indexed | 2024-03-10T15:12:31Z |
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| id | doaj.art-f8f1ec9d2e6c4ce1bbf47fc5d16c639f |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T15:12:31Z |
| publishDate | 2020-10-01 |
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| series | Nanomaterials |
| spelling | doaj.art-f8f1ec9d2e6c4ce1bbf47fc5d16c639f2023-11-20T19:14:25ZengMDPI AGNanomaterials2079-49912020-10-011011217110.3390/nano10112171Synthesis of Blue-Emissive InP/GaP/ZnS Quantum Dots via Controlling the Reaction Kinetics of Shell Growth and Length of Capping LigandsWoosuk Lee0Changmin Lee1Boram Kim2Yonghyeok Choi3Heeyeop Chae4School of Chemical Engineering, Sungkyunkwan University (SKKU), 2066, Seoburo, Suwon 16419, KoreaSchool of Chemical Engineering, Sungkyunkwan University (SKKU), 2066, Seoburo, Suwon 16419, KoreaSchool of Chemical Engineering, Sungkyunkwan University (SKKU), 2066, Seoburo, Suwon 16419, KoreaSchool of Chemical Engineering, Sungkyunkwan University (SKKU), 2066, Seoburo, Suwon 16419, KoreaSchool of Chemical Engineering, Sungkyunkwan University (SKKU), 2066, Seoburo, Suwon 16419, KoreaThe development of blue-emissive InP quantum dots (QDs) still lags behind that of the red and green QDs because of the difficulty in controlling the reactivity of the small InP core. In this study, the reaction kinetics of the ZnS shell was controlled by varying the length of the hydrocarbon chain in alkanethiols for the synthesis of the small InP core. The reactive alkanethiol with a short hydrocarbon chain forms the ZnS shell rapidly and prevents the growth of the InP core, thus reducing the emission wavelength. In addition, the length of the hydrocarbon chain in the fatty acid was varied to reduce the nucleation kinetics of the core. The fatty acid with a long hydrocarbon chain exhibited a long emission wavelength as a result of the rapid nucleation and growth, due to the insufficient In–P–Zn complex by the steric effect. Blue-emissive InP/GaP/ZnS QDs were synthesized with hexanethiol and lauryl acid, exhibiting a photoluminescence (PL) peak of 485 nm with a full width at half-maximum of 52 nm and a photoluminescence quantum yield of 45%. The all-solution processed quantum dot light-emitting diodes were fabricated by employing the aforementioned blue-emissive QDs as an emitting layer, and the resulting device exhibited a peak luminance of 1045 cd/m<sup>2</sup>, a current efficiency of 3.6 cd/A, and an external quantum efficiency of 1.0%.https://www.mdpi.com/2079-4991/10/11/2171non-Cd blue emittersInP/Ga/ZnS quantum dotsfatty acidheating-up synthesis |
| spellingShingle | Woosuk Lee Changmin Lee Boram Kim Yonghyeok Choi Heeyeop Chae Synthesis of Blue-Emissive InP/GaP/ZnS Quantum Dots via Controlling the Reaction Kinetics of Shell Growth and Length of Capping Ligands Nanomaterials non-Cd blue emitters InP/Ga/ZnS quantum dots fatty acid heating-up synthesis |
| title | Synthesis of Blue-Emissive InP/GaP/ZnS Quantum Dots via Controlling the Reaction Kinetics of Shell Growth and Length of Capping Ligands |
| title_full | Synthesis of Blue-Emissive InP/GaP/ZnS Quantum Dots via Controlling the Reaction Kinetics of Shell Growth and Length of Capping Ligands |
| title_fullStr | Synthesis of Blue-Emissive InP/GaP/ZnS Quantum Dots via Controlling the Reaction Kinetics of Shell Growth and Length of Capping Ligands |
| title_full_unstemmed | Synthesis of Blue-Emissive InP/GaP/ZnS Quantum Dots via Controlling the Reaction Kinetics of Shell Growth and Length of Capping Ligands |
| title_short | Synthesis of Blue-Emissive InP/GaP/ZnS Quantum Dots via Controlling the Reaction Kinetics of Shell Growth and Length of Capping Ligands |
| title_sort | synthesis of blue emissive inp gap zns quantum dots via controlling the reaction kinetics of shell growth and length of capping ligands |
| topic | non-Cd blue emitters InP/Ga/ZnS quantum dots fatty acid heating-up synthesis |
| url | https://www.mdpi.com/2079-4991/10/11/2171 |
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