Ultrathin CdSe/CdS and CdSe/ZnS core-shell nanoplatelets: The impact of the shell material on the structure and optical properties
| Autor: | V.B. Zaytsev, V.F. Kozlovsky, B. M. Saidzhonov, Roman B. Vasiliev |
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| Rok vydání: | 2019 |
| Předmět: |
Thickness dependent
Materials science business.industry Biophysics Shell (structure) Nanoparticle Heterojunction 02 engineering and technology General Chemistry Electronic structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Laser 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics 0104 chemical sciences law.invention Core shell law Optoelectronics 0210 nano-technology business Absorption (electromagnetic radiation) |
| Zdroj: | Journal of Luminescence. 209:170-178 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2019.01.052 |
| Popis: | In this study, we analyzed the effect of the composition and thickness of shell material on morphology, structure and optical properties of ultrathin CdSe/CdS, CdSe/CdS/ZnS and CdSe/ZnS core-shell nanoplatelets. It is shown that the growth of CdS and ZnS shells on ultrathin CdSe nanoplatelets with excitonic absorption at 463 nm leads to the formation of flat CdSe/CdS and CdSe/CdS/ZnS and folded CdSe/ZnS core-shell heterostructures, respectively. The tuning of the first excitonic transition in a range of 510–635 nm is shown by changing the composition and thickness of the shell material. Despite large lateral sizes, the CdSe/CdS and CdSe/CdS/ZnS core-shell nanoplatelets showed narrow emission bands with about 18–21 nm width. Emission width of the CdSe/ZnS heterostructures is shown to be thickness dependent and broader than that of CdSe/CdS and CdSe/CdS/ZnS heterostructures. Such control of the electronic structure of 2D core-shell nanoparticles, simply by changing the thickness and composition of the shell material may be attractive for the light-emitting device technology and lasers. |
| Databáze: | OpenAIRE |
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